diff --git a/app/src/main/java/org/prolibertate/games/game/catan/CatanAi.kt b/app/src/main/java/org/prolibertate/games/game/catan/CatanAi.kt
index 5d1bc63..37041e8 100644
--- a/app/src/main/java/org/prolibertate/games/game/catan/CatanAi.kt
+++ b/app/src/main/java/org/prolibertate/games/game/catan/CatanAi.kt
@@ -277,6 +277,10 @@ class CatanAi(private val profiles: AiProfiles = AiProfiles.DEFAULT) : GameAi<Ca
             pickBest(settlements, profile) { spotValue(state, it.vertex) }?.let { return it }
         }
 
+        // A raid on a fortress, or the next stage of a wonder, beats a card.
+        legal.filterIsInstance<RaidFortress>().firstOrNull()?.let { return it }
+        legal.filterIsInstance<BuildWonder>().firstOrNull()?.let { return it }
+
         // Seafarers: a ship toward an island nobody has landed on is worth more than a card.
         legal.filterIsInstance<BuildShip>()
             .filter { shipValue(state, seat, it.edge) > 0.5 }
@@ -661,6 +665,11 @@ class CatanAi(private val profiles: AiProfiles = AiProfiles.DEFAULT) : GameAi<Ca
                 if (!seen.add(v)) continue
                 // Fog is worth a look: a card on arrival, and land to settle that nobody has seen.
                 if (topo.VERTEX_HEXES[v].any { state.terrains[it] == Terrain.FOG }) best = maxOf(best, FOG_LURE * Math.pow(0.85, depth.toDouble()))
+                // A fortress is worth a raid once a ship lies beside it.
+                if (sea.fortress.isNotEmpty() && topo.VERTEX_EDGES[v].any { e ->
+                        topo.edgeSea[e] && topo.EDGE_HEXES[e].any { sea.fortress.getOrElse(it) { 0 } > 0 }
+                    }
+                ) best = maxOf(best, FORT_LURE * Math.pow(0.85, depth.toDouble()))
                 if (CatanRules.vertexOpenForSettlement(state, v)) {
                     val island = topo.vertexIsland[v]
                     val fresh = island >= 0 && !sea.isStart(island) && sea.islandBonus[island] == NO_PLAYER
@@ -693,6 +702,7 @@ class CatanAi(private val profiles: AiProfiles = AiProfiles.DEFAULT) : GameAi<Ca
 
         /** What a ship end beside undiscovered land is worth, on the scale of [spotValue]. */
         const val FOG_LURE = 0.6
+        const val FORT_LURE = 1.2
         const val CLOTH_WORTH = 2.5
         const val CHIP_LURE = 0.5
     }
diff --git a/app/src/main/java/org/prolibertate/games/game/catan/CatanCk.kt b/app/src/main/java/org/prolibertate/games/game/catan/CatanCk.kt
index 8d4579a..44507e1 100644
--- a/app/src/main/java/org/prolibertate/games/game/catan/CatanCk.kt
+++ b/app/src/main/java/org/prolibertate/games/game/catan/CatanCk.kt
@@ -351,6 +351,7 @@ object CatanCk {
         if (state.isSea) {
             if (affordable(state, seat, SeaRules.SHIP_COST)) moves += SeaRules.buildShipMoves(state, seat)
             moves += SeaRules.moveShipMoves(state, seat)
+            moves += SeaRules.scenarioMoves(state, seat)
         }
         if (affordable(state, seat, CatanRules.SETTLEMENT_COST)) {
             moves += CatanRules.settlementVertices(state, seat).map { BuildSettlement(it) }
diff --git a/app/src/main/java/org/prolibertate/games/game/catan/CatanCkAi.kt b/app/src/main/java/org/prolibertate/games/game/catan/CatanCkAi.kt
index 30bff34..8925400 100644
--- a/app/src/main/java/org/prolibertate/games/game/catan/CatanCkAi.kt
+++ b/app/src/main/java/org/prolibertate/games/game/catan/CatanCkAi.kt
@@ -214,6 +214,9 @@ internal class CatanCkAi(
             settlements.maxByOrNull { ai.spotValue(state, it.vertex) }?.let { return it }
         }
 
+        legal.filterIsInstance<RaidFortress>().firstOrNull()?.let { return it }
+        legal.filterIsInstance<BuildWonder>().firstOrNull()?.let { return it }
+
         // Seafarers: a ship toward land nobody has settled is worth more than a card.
         legal.filterIsInstance<BuildShip>()
             .filter { ai.shipValue(state, seat, it.edge) > 0.5 }
diff --git a/app/src/main/java/org/prolibertate/games/game/catan/CatanModel.kt b/app/src/main/java/org/prolibertate/games/game/catan/CatanModel.kt
index 2cd5ac6..1ed0481 100644
--- a/app/src/main/java/org/prolibertate/games/game/catan/CatanModel.kt
+++ b/app/src/main/java/org/prolibertate/games/game/catan/CatanModel.kt
@@ -63,6 +63,12 @@ enum class Terrain(val produces: Resource?) {
 
     /** Seafarers, Cloth for Catan: a village. It pays cloth, not cards, to the settlements around it when its number rolls. */
     VILLAGE(null),
+
+    /**
+     * Seafarers, Pirate Islands: a pirate fortress. It stands until ships raid it (`SeaState.fortress`), and
+     * nobody settles its island meanwhile. Once taken it becomes desert.
+     */
+    FORTRESS(null),
 }
 
 /** Axial coordinate of one hex on the board. See [CatanBoard]. */
@@ -495,6 +501,12 @@ data class SeaState(
     val harbourSeats: List<Int> = emptyList(),
     /** Victory points each seat holds from tribe chips; empty until one is taken. */
     val chipPoints: List<Int> = emptyList(),
+    /** Strength still left in each hex's pirate fortress, by hex (Pirate Islands); empty when the map has none. */
+    val fortress: List<Int> = emptyList(),
+    /** Victory points each seat holds for taking fortresses; empty until one falls. */
+    val raidPoints: List<Int> = emptyList(),
+    /** Wonder stages each seat has built (Wonders of Catan), by seat; empty when the scenario has none. */
+    val wonders: List<Int> = emptyList(),
 )
 
 /** What the first settler beside a tribe hex takes (Forgotten Tribe). */
@@ -541,3 +553,13 @@ data class MovePirate(val hex: HexCoord, val victim: Int? = null) : CatanMove
 @Serializable
 @SerialName("gold")
 data class PickGold(val cards: List<Resource>) : CatanMove
+
+/** Raid the pirate fortress on [hex] from a ship beside it: 1 ore, 1 wool and 1 grain take one point of its strength. */
+@Serializable
+@SerialName("raid")
+data class RaidFortress(val hex: HexCoord) : CatanMove
+
+/** Build the next stage of your wonder, which needs a city of yours; the stage's cost is in `SeaRules.WONDER_STAGES`. */
+@Serializable
+@SerialName("wonder")
+data object BuildWonder : CatanMove
diff --git a/app/src/main/java/org/prolibertate/games/game/catan/CatanRules.kt b/app/src/main/java/org/prolibertate/games/game/catan/CatanRules.kt
index 95d8705..2f20df9 100644
--- a/app/src/main/java/org/prolibertate/games/game/catan/CatanRules.kt
+++ b/app/src/main/java/org/prolibertate/games/game/catan/CatanRules.kt
@@ -124,6 +124,8 @@ object CatanRules : GameRules<CatanState, CatanMove> {
                     cloth = if (it.villageCloth.isEmpty()) emptyList() else List(options.playerCount) { 0 },
                     villageCloth = it.villageCloth,
                     chips = it.chips,
+                    fortress = it.fortress,
+                    wonders = if (scenario == SeaScenario.WONDERS_OF_CATAN) List(options.playerCount) { 0 } else emptyList(),
                 )
             },
         )
@@ -251,7 +253,7 @@ object CatanRules : GameRules<CatanState, CatanMove> {
     private fun robberMoves(state: CatanState, seat: Int): List<MoveRobber> {
         val moves = mutableListOf<MoveRobber>()
         for (h in 0 until state.topo.HEX_COUNT) {
-            if (h == state.robber || !state.topo.land[h] || state.terrains[h] == Terrain.FOG) continue
+            if (h == state.robber || !state.topo.land[h] || state.terrains[h] == Terrain.FOG || state.terrains[h] == Terrain.FORTRESS) continue
             val victims = state.topo.HEX_CORNERS[h]
                 .mapNotNull { state.buildings[it] }
                 .map { it.owner }
@@ -283,6 +285,7 @@ object CatanRules : GameRules<CatanState, CatanMove> {
         if (state.isSea) {
             if (affordable(state, seat, SeaRules.SHIP_COST)) moves += SeaRules.buildShipMoves(state, seat)
             moves += SeaRules.moveShipMoves(state, seat)
+            moves += SeaRules.scenarioMoves(state, seat)
         }
 
         if (!state.devCardPlayedThisTurn) {
@@ -417,6 +420,7 @@ object CatanRules : GameRules<CatanState, CatanMove> {
     /** An empty vertex with no building on it or one edge away. */
     internal fun vertexOpenForSettlement(state: CatanState, v: Int): Boolean =
         state.buildings[v] == null && !hasKnight(state, v) && state.topo.vertexLand[v] &&
+            !SeaRules.fortressHolds(state, v) &&
             state.topo.VERTEX_NEIGHBORS[v].all { state.buildings[it] == null }
 
     /**
@@ -470,6 +474,8 @@ object CatanRules : GameRules<CatanState, CatanMove> {
             is MoveShip -> applyMoveShip(state, seat, move)
             is MovePirate -> applyMovePirate(state, seat, move)
             is PickGold -> applyPickGold(state, seat, move)
+            is RaidFortress -> SeaRules.applyRaid(state, seat, move)
+            BuildWonder -> SeaRules.applyWonder(state, seat)
             is BuildRoad -> applyBuildRoad(state, seat, move)
             is BuildSettlement -> applyBuildSettlement(state, seat, move)
             is BuildCity -> applyBuildCity(state, seat, move)
diff --git a/app/src/main/java/org/prolibertate/games/game/catan/CatanSeaBoard.kt b/app/src/main/java/org/prolibertate/games/game/catan/CatanSeaBoard.kt
index 24748ce..2a90a1e 100644
--- a/app/src/main/java/org/prolibertate/games/game/catan/CatanSeaBoard.kt
+++ b/app/src/main/java/org/prolibertate/games/game/catan/CatanSeaBoard.kt
@@ -24,6 +24,16 @@ enum class SeaScenario(val title: String, val blurb: String, val start: SeaStart
         "A home island, an islet, and a bank of fog. Land in the fog is face down until a road or ship reaches it; " +
             "the finder takes a card of what lies there.",
     ),
+    PIRATE_ISLANDS(
+        "Pirate Islands",
+        "Two isles are held by pirate fortresses. Sail ships beside one and raid it with ore, wool and grain; " +
+            "nobody may settle the isle until the fortress falls, and the one who takes it earns two points.",
+    ),
+    WONDERS_OF_CATAN(
+        "Wonders of Catan",
+        "Two big islands and room to grow. Raise a city, then build a wonder in four stages; each stage is a " +
+            "victory point and the first to finish all four wins.",
+    ),
     CLOTH_FOR_CATAN(
         "Cloth for Catan",
         "Four villages weave cloth. Settle beside one and it pays you a cloth token whenever its number rolls; " +
@@ -126,11 +136,36 @@ object SeaBoards {
         "............",
     )
 
+    /** `P` is a pirate fortress. */
+    private val PIRATE_ISLANDS_MAP = listOf(
+        "............",
+        "..####.P##..",
+        "..####..##..",
+        "..####......",
+        "..####..P#..",
+        "...##...##..",
+        "............",
+        "............",
+    )
+
+    private val WONDERS_OF_CATAN_MAP = listOf(
+        "............",
+        "..####.###..",
+        ".#####.####.",
+        "..###D.###..",
+        ".......##...",
+        "..$......$..",
+        "...##.......",
+        "............",
+    )
+
     private fun rows(scenario: SeaScenario): List<String> = when (scenario) {
         SeaScenario.NEW_SHORES -> NEW_SHORES_MAP
         SeaScenario.FOUR_ISLANDS -> FOUR_ISLANDS_MAP
         SeaScenario.THROUGH_THE_DESERT -> THROUGH_THE_DESERT_MAP
         SeaScenario.FOG_ISLANDS -> FOG_ISLANDS_MAP
+        SeaScenario.PIRATE_ISLANDS -> PIRATE_ISLANDS_MAP
+        SeaScenario.WONDERS_OF_CATAN -> WONDERS_OF_CATAN_MAP
         SeaScenario.CLOTH_FOR_CATAN -> CLOTH_FOR_CATAN_MAP
         SeaScenario.FORGOTTEN_TRIBE -> FORGOTTEN_TRIBE_MAP
     }
@@ -178,6 +213,8 @@ object SeaBoards {
         val chips: List<TribeChip> = emptyList(),
         /** Cloth waiting on each village, by hex; empty when the map has none. */
         val villageCloth: List<Int> = emptyList(),
+        /** Strength of the fortress on each hex, by hex; empty when the map has none. */
+        val fortress: List<Int> = emptyList(),
     )
 
     /** An island of this many land hexes or more can be started on. */
@@ -186,6 +223,9 @@ object SeaBoards {
     /** Cloth each village starts with. */
     const val VILLAGE_CLOTH = 6
 
+    /** Ships' raids a pirate fortress takes to fall. */
+    const val FORTRESS_STRENGTH = 3
+
     private val RESOURCE_TILES = listOf(
         Terrain.FOREST, Terrain.PASTURE, Terrain.FIELDS, Terrain.HILLS, Terrain.MOUNTAINS,
     )
@@ -209,13 +249,14 @@ object SeaBoards {
                 'D' -> Terrain.DESERT
                 '#', 't' -> pool[plain.indexOf(h)]
                 'V' -> Terrain.VILLAGE
+                'P' -> Terrain.FORTRESS
                 'F' -> Terrain.FOG
                 else -> Terrain.SEA
             }
         }
 
         // The fog hexes take part as slots, so the tokens they hide are dealt from the same pile.
-        val numbered = terrains.indices.filter { terrains[it] != Terrain.SEA && terrains[it] != Terrain.DESERT }
+        val numbered = terrains.indices.filter { terrains[it] != Terrain.SEA && terrains[it] != Terrain.DESERT && terrains[it] != Terrain.FORTRESS }
         check(numbered.size <= TOKENS.size) { "Not enough number tokens for ${numbered.size} hexes" }
         val tokens = TOKENS.take(numbered.size).shuffled(random)
         val numbers = IntArray(terrains.size)
@@ -287,6 +328,12 @@ object SeaBoards {
             List(terrains.size) { h -> if (terrains[h] == Terrain.VILLAGE) VILLAGE_CLOTH else 0 }
         }
 
-        return Generated(terrains, numbers.toList(), desert, pirate, ports, home, starts, fogDeck, chips, villages)
+        val fortress = if (kinds.none { it == 'P' }) {
+            emptyList()
+        } else {
+            List(terrains.size) { h -> if (terrains[h] == Terrain.FORTRESS) FORTRESS_STRENGTH else 0 }
+        }
+
+        return Generated(terrains, numbers.toList(), desert, pirate, ports, home, starts, fogDeck, chips, villages, fortress)
     }
 }
diff --git a/app/src/main/java/org/prolibertate/games/game/catan/CatanSeaRules.kt b/app/src/main/java/org/prolibertate/games/game/catan/CatanSeaRules.kt
index 594cdc8..e1b6dd6 100644
--- a/app/src/main/java/org/prolibertate/games/game/catan/CatanSeaRules.kt
+++ b/app/src/main/java/org/prolibertate/games/game/catan/CatanSeaRules.kt
@@ -205,6 +205,8 @@ internal object SeaRules {
     fun bonusPoints(state: CatanState, seat: Int): Int {
         val sea = state.sea ?: return 0
         return sea.islandBonus.count { it == seat } * ISLAND_BONUS +
+            (sea.raidPoints.getOrNull(seat) ?: 0) +
+            (sea.wonders.getOrNull(seat) ?: 0) +
             clothOf(state, seat) / CLOTH_PER_POINT +
             (sea.chipPoints.getOrNull(seat) ?: 0)
     }
@@ -252,6 +254,101 @@ internal object SeaRules {
         return s
     }
 
+    // -----------------------------------------------------------------------
+    // Pirate Islands
+    // -----------------------------------------------------------------------
+
+    val RAID_COST: Map<Resource, Int> = mapOf(Resource.ORE to 1, Resource.WOOL to 1, Resource.GRAIN to 1)
+
+    const val FORTRESS_POINTS = 2
+
+    /** Whether a pirate fortress still stands on the island [vertex] is part of, so nobody may settle there. */
+    fun fortressHolds(state: CatanState, vertex: Int): Boolean {
+        val sea = state.sea ?: return false
+        if (sea.fortress.isEmpty()) return false
+        val island = state.topo.vertexIsland[vertex]
+        return island >= 0 && sea.fortress.indices.any { sea.fortress[it] > 0 && state.topo.islandOf[it] == island }
+    }
+
+    /** Fortress hexes [seat] has a ship beside. */
+    private fun raidTargets(state: CatanState, seat: Int): List<Int> {
+        val sea = state.sea!!
+        if (sea.fortress.isEmpty()) return emptyList()
+        val topo = state.topo
+        return sea.fortress.indices.filter { h ->
+            sea.fortress[h] > 0 && (0 until topo.EDGE_COUNT).any { h in topo.EDGE_HEXES[it] && sea.ships[it] == seat }
+        }
+    }
+
+    fun applyRaid(state: CatanState, seat: Int, move: RaidFortress): CatanState {
+        val sea = state.sea!!
+        val hex = state.topo.hexIndex.getValue(move.hex)
+        val left = sea.fortress[hex] - 1
+        var s = state.copy(resources = CatanRules.withCounts(state.resources, seat, RAID_COST, -1))
+        val strength = sea.fortress.toMutableList().also { it[hex] = left }
+        if (left > 0) {
+            return s.copy(
+                sea = sea.copy(fortress = strength),
+                log = s.log + "Seat $seat raids the fortress at (${move.hex.q},${move.hex.r}); $left strength left.",
+            )
+        }
+        val points = sea.raidPoints.ifEmpty { List(state.playerCount) { 0 } }.toMutableList().also { it[seat] += FORTRESS_POINTS }
+        s = s.copy(
+            terrains = s.terrains.toMutableList().also { it[hex] = Terrain.DESERT },
+            sea = sea.copy(fortress = strength, raidPoints = points),
+            log = s.log + "Seat $seat takes the fortress at (${move.hex.q},${move.hex.r}): +$FORTRESS_POINTS victory points, " +
+                "and the island is open.",
+        )
+        return CatanRules.checkWin(s)
+    }
+
+    // -----------------------------------------------------------------------
+    // Wonders of Catan
+    // -----------------------------------------------------------------------
+
+    /** What each of the four stages of a wonder costs. */
+    val WONDER_STAGES: List<Map<Resource, Int>> = listOf(
+        mapOf(Resource.BRICK to 2, Resource.LUMBER to 1, Resource.GRAIN to 1),
+        mapOf(Resource.BRICK to 1, Resource.ORE to 2, Resource.WOOL to 1),
+        mapOf(Resource.ORE to 3, Resource.GRAIN to 1, Resource.LUMBER to 1),
+        mapOf(Resource.ORE to 3, Resource.GRAIN to 2, Resource.BRICK to 1),
+    )
+
+    /** The next stage [seat] could build, if the scenario has wonders and the seat has a city to raise it in. */
+    private fun nextStage(state: CatanState, seat: Int): Map<Resource, Int>? {
+        val stage = state.sea?.wonders?.getOrNull(seat) ?: return null
+        if (stage >= WONDER_STAGES.size) return null
+        if (state.buildings.none { it?.owner == seat && it.type == BuildingType.CITY }) return null
+        return WONDER_STAGES[stage]
+    }
+
+    /** The extra moves a scenario offers during play: raids and wonder stages. */
+    fun scenarioMoves(state: CatanState, seat: Int): List<CatanMove> {
+        val moves = mutableListOf<CatanMove>()
+        if (CatanRules.affordable(state, seat, RAID_COST)) {
+            raidTargets(state, seat).forEach { moves += RaidFortress(state.topo.HEXES[it]) }
+        }
+        nextStage(state, seat)?.let { if (CatanRules.affordable(state, seat, it)) moves += BuildWonder }
+        return moves
+    }
+
+    fun applyWonder(state: CatanState, seat: Int): CatanState {
+        val sea = state.sea!!
+        val stage = sea.wonders[seat] + 1
+        val built = sea.wonders.toMutableList().also { it[seat] = stage }
+        val s = state.copy(
+            resources = CatanRules.withCounts(state.resources, seat, WONDER_STAGES[stage - 1], -1),
+            sea = sea.copy(wonders = built),
+            log = state.log + "Seat $seat builds stage $stage of a wonder.",
+        )
+        if (stage < WONDER_STAGES.size) return CatanRules.checkWin(s)
+        return s.copy(
+            phase = CatanPhase.GAME_OVER,
+            winner = seat,
+            log = s.log + "Seat $seat completes a wonder of Catan and wins.",
+        )
+    }
+
     // -----------------------------------------------------------------------
     // The Forgotten Tribe
     // -----------------------------------------------------------------------
diff --git a/app/src/main/java/org/prolibertate/games/ui/game/catan/CatanBoardView.kt b/app/src/main/java/org/prolibertate/games/ui/game/catan/CatanBoardView.kt
index 49d3f1d..6d9532a 100644
--- a/app/src/main/java/org/prolibertate/games/ui/game/catan/CatanBoardView.kt
+++ b/app/src/main/java/org/prolibertate/games/ui/game/catan/CatanBoardView.kt
@@ -170,6 +170,7 @@ private fun DrawScope.drawHexes(
         val sea = state.sea
         val note = when {
             state.terrains[hex] == Terrain.VILLAGE && sea != null -> "${sea.villageCloth.getOrElse(hex) { 0 }} cloth"
+            state.terrains[hex] == Terrain.FORTRESS && sea != null -> "fort ${sea.fortress.getOrElse(hex) { 0 }}"
             else -> when (sea?.chips?.getOrNull(hex)) {
                 TribeChip.POINT -> "+1 VP"
                 TribeChip.HARBOUR -> "3:1"
diff --git a/app/src/main/java/org/prolibertate/games/ui/game/catan/CatanHud.kt b/app/src/main/java/org/prolibertate/games/ui/game/catan/CatanHud.kt
index 933980c..31fc508 100644
--- a/app/src/main/java/org/prolibertate/games/ui/game/catan/CatanHud.kt
+++ b/app/src/main/java/org/prolibertate/games/ui/game/catan/CatanHud.kt
@@ -173,6 +173,8 @@ object CatanHudGlyphs {
         BuildKind.WALL -> "▦"
         BuildKind.KNIGHT -> "♞"
         BuildKind.SHIP -> "⛵"
+        BuildKind.RAID -> "⚔"
+        BuildKind.WONDER -> "✦"
     }
 
     fun label(kind: BuildKind): String = when (kind) {
@@ -182,6 +184,8 @@ object CatanHudGlyphs {
         BuildKind.WALL -> CatanText.WALL
         BuildKind.KNIGHT -> CatanText.KNIGHT
         BuildKind.SHIP -> CatanText.SHIP
+        BuildKind.RAID -> CatanText.RAID
+        BuildKind.WONDER -> CatanText.WONDER
     }
 }
 
diff --git a/app/src/main/java/org/prolibertate/games/ui/game/catan/CatanInteraction.kt b/app/src/main/java/org/prolibertate/games/ui/game/catan/CatanInteraction.kt
index 80b486e..f83f73d 100644
--- a/app/src/main/java/org/prolibertate/games/ui/game/catan/CatanInteraction.kt
+++ b/app/src/main/java/org/prolibertate/games/ui/game/catan/CatanInteraction.kt
@@ -6,7 +6,9 @@ import org.prolibertate.games.game.catan.ActivateKnight
 import org.prolibertate.games.game.catan.BuildCity
 import org.prolibertate.games.game.catan.BuildRoad
 import org.prolibertate.games.game.catan.BuildShip
+import org.prolibertate.games.game.catan.BuildWonder
 import org.prolibertate.games.game.catan.MovePirate
+import org.prolibertate.games.game.catan.RaidFortress
 import org.prolibertate.games.game.catan.MoveShip
 import org.prolibertate.games.game.catan.Topology
 import org.prolibertate.games.game.catan.BuildSettlement
@@ -67,13 +69,34 @@ enum class BuildKind {
     ROAD, SETTLEMENT, CITY, WALL, KNIGHT,
 
     /** Seafarers: a ship, laid on a sea edge. */
-    SHIP;
+    SHIP,
+
+    /** Pirate Islands: raid a fortress; the target is the fortress hex. */
+    RAID,
+
+    /** Wonders of Catan: the next stage of the wonder, which needs no tap on the board. */
+    WONDER;
 
     companion object {
         val BASE: List<BuildKind> = listOf(ROAD, SETTLEMENT, CITY)
 
         /** Seafarers adds the ship, listed after the road it sails beside. */
         val SEAFARERS: List<BuildKind> = listOf(ROAD, SHIP, SETTLEMENT, CITY)
+
+        /** The kinds a table's build menu lists: the scenario's own raid or wonder follows the usual ones. */
+        fun of(state: CatanState): List<BuildKind> {
+            val sea = state.sea
+            val extras = buildList {
+                if (sea != null && sea.fortress.isNotEmpty()) add(RAID)
+                if (sea != null && sea.wonders.isNotEmpty()) add(WONDER)
+            }
+            val usual = when {
+                state.isCk -> entries.filter { it != SHIP || state.isSea } - listOf(RAID, WONDER)
+                state.isSea -> SEAFARERS
+                else -> BASE
+            }
+            return usual + extras
+        }
     }
 }
 
@@ -252,6 +275,10 @@ object CatanInteraction {
         return when (building) {
             BuildKind.ROAD -> BoardTargets(edges = roads)
             BuildKind.SHIP -> BoardTargets(edges = ships)
+            BuildKind.RAID -> BoardTargets(
+                hexes = legal.filterIsInstance<RaidFortress>().mapNotNull { state.topo.hexIndex[it.hex] }.toSet(),
+            )
+            BuildKind.WONDER -> BoardTargets()
             BuildKind.SETTLEMENT ->
                 BoardTargets(vertices = legal.filterIsInstance<BuildSettlement>().map { it.vertex }.toSet())
 
@@ -519,6 +546,7 @@ object CatanInteraction {
         val coord = topo.HEXES.getOrNull(hex) ?: return TapOutcome.Ignored
         val moves = legal.filterIsInstance<MoveRobber>().filter { it.hex == coord }
         val pirates = legal.filterIsInstance<MovePirate>().filter { it.hex == coord }
+        legal.firstOrNull { it is RaidFortress && it.hex == coord }?.let { return TapOutcome.Submit(it) }
         return when {
             moves.isNotEmpty() -> if (moves.size == 1) {
                 TapOutcome.Submit(moves.first())
@@ -586,6 +614,8 @@ object CatanInteraction {
         if (legal.any { it is BuildShip }) add(BuildKind.SHIP)
         if (legal.any { it is BuildSettlement }) add(BuildKind.SETTLEMENT)
         if (legal.any { it is BuildCity }) add(BuildKind.CITY)
+        if (legal.any { it is RaidFortress }) add(BuildKind.RAID)
+        if (legal.any { it is BuildWonder }) add(BuildKind.WONDER)
         if (legal.any { it is BuildWall }) add(BuildKind.WALL)
         if (legal.any { it is HireKnight }) add(BuildKind.KNIGHT)
     }
diff --git a/app/src/main/java/org/prolibertate/games/ui/game/catan/CatanPanels.kt b/app/src/main/java/org/prolibertate/games/ui/game/catan/CatanPanels.kt
index 779b0df..00a4812 100644
--- a/app/src/main/java/org/prolibertate/games/ui/game/catan/CatanPanels.kt
+++ b/app/src/main/java/org/prolibertate/games/ui/game/catan/CatanPanels.kt
@@ -600,6 +600,8 @@ private fun buildLabel(kind: BuildKind): String = when (kind) {
     BuildKind.WALL -> CatanText.WALL
     BuildKind.KNIGHT -> CatanText.KNIGHT
     BuildKind.SHIP -> CatanText.SHIP
+    BuildKind.RAID -> CatanText.RAID
+    BuildKind.WONDER -> CatanText.WONDER
 }
 
 private fun buildCost(kind: BuildKind): String = when (kind) {
@@ -609,6 +611,8 @@ private fun buildCost(kind: BuildKind): String = when (kind) {
     BuildKind.WALL -> CatanText.WALL_COST
     BuildKind.KNIGHT -> CatanText.KNIGHT_COST
     BuildKind.SHIP -> CatanText.SHIP_COST_TEXT
+    BuildKind.RAID -> CatanText.RAID_COST
+    BuildKind.WONDER -> CatanText.WONDER_COST
 }
 
 @Composable
@@ -642,6 +646,7 @@ private fun seaAwards(state: CatanState, seat: Int, compact: Boolean): List<Stri
     val sea = state.sea ?: return emptyList()
     return buildList {
         if (sea.cloth.isNotEmpty()) add(if (compact) "${sea.cloth[seat]}c" else "Cloth ${sea.cloth[seat]}")
+        if (sea.wonders.isNotEmpty()) add(if (compact) "W${sea.wonders[seat]}" else "Wonder ${sea.wonders[seat]}/4")
         if (seat in sea.harbourSeats) add(if (compact) "3:1" else "Harbour 3:1")
     }
 }
diff --git a/app/src/main/java/org/prolibertate/games/ui/game/catan/CatanScreen.kt b/app/src/main/java/org/prolibertate/games/ui/game/catan/CatanScreen.kt
index b5659e9..682d2ff 100644
--- a/app/src/main/java/org/prolibertate/games/ui/game/catan/CatanScreen.kt
+++ b/app/src/main/java/org/prolibertate/games/ui/game/catan/CatanScreen.kt
@@ -39,6 +39,7 @@ import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import org.prolibertate.games.game.catan.AcceptTrade
 import org.prolibertate.games.game.catan.AqueductChore
+import org.prolibertate.games.game.catan.BuildWonder
 import org.prolibertate.games.game.catan.BuyDevCard
 import org.prolibertate.games.game.catan.CatanCk
 import org.prolibertate.games.game.catan.CatanMove
@@ -159,6 +160,14 @@ fun CatanScreen(
         }
     }
 
+    // A wonder stage needs no tap on the board: choosing it from the menu builds it.
+    LaunchedEffect(building) {
+        if (building == BuildKind.WONDER) {
+            legal.firstOrNull { it is BuildWonder }?.let { controller.submit(it) }
+            building = null
+        }
+    }
+
     val submit: (CatanMove) -> Unit = { move ->
         controller.submit(move)
         building = null
@@ -197,11 +206,7 @@ fun CatanScreen(
     val progressHand = CatanInteraction.progressHand(current, localSeat, legal)
     val playing = current.phase == CatanPhase.PLAYING && legal.isNotEmpty()
     val actions = CatanActions(
-        buildKinds = when {
-            current.isCk -> BuildKind.entries.filter { it != BuildKind.SHIP || current.isSea }
-            current.isSea -> BuildKind.SEAFARERS
-            else -> BuildKind.BASE
-        },
+        buildKinds = BuildKind.of(current),
         ck = current.isCk,
         canImprove = CatanInteraction.improvable(legal).isNotEmpty(),
         canPlayProgress = progressHand.any { it.playable },
diff --git a/app/src/main/java/org/prolibertate/games/ui/game/catan/CatanStyle.kt b/app/src/main/java/org/prolibertate/games/ui/game/catan/CatanStyle.kt
index 1d6c65b..273df93 100644
--- a/app/src/main/java/org/prolibertate/games/ui/game/catan/CatanStyle.kt
+++ b/app/src/main/java/org/prolibertate/games/ui/game/catan/CatanStyle.kt
@@ -128,6 +128,8 @@ private val LightStyle = CatanStyle(
         Terrain.FOG to Color(0xFFB9C2C9),
         // Cloth villages: a dyed-cloth purple.
         Terrain.VILLAGE to Color(0xFF9B6BB5),
+        // A pirate fortress: dark stone.
+        Terrain.FORTRESS to Color(0xFF4A4F57),
     ),
     hexEdge = Color(0x55000000),
     token = Color(0xFFF7EFD9),
diff --git a/app/src/main/java/org/prolibertate/games/ui/game/catan/CatanText.kt b/app/src/main/java/org/prolibertate/games/ui/game/catan/CatanText.kt
index 188a792..038e6a3 100644
--- a/app/src/main/java/org/prolibertate/games/ui/game/catan/CatanText.kt
+++ b/app/src/main/java/org/prolibertate/games/ui/game/catan/CatanText.kt
@@ -76,6 +76,7 @@ object CatanText {
         Terrain.GOLD -> "Gold field"
         Terrain.FOG -> "Fog"
         Terrain.VILLAGE -> "Village"
+        Terrain.FORTRESS -> "Pirate fortress"
     }
 
     fun devCard(type: DevCardType): String = when (type) {
@@ -115,6 +116,10 @@ object CatanText {
     const val SEA_ROBBER = "Move the robber (tap a land hex) or the pirate (tap a sea hex)."
     const val SHIP = "Ship"
     const val SHIP_COST_TEXT = "1 lumber + 1 wool"
+    const val RAID = "Raid"
+    const val RAID_COST = "1 ore + 1 wool + 1 grain"
+    const val WONDER = "Wonder"
+    const val WONDER_COST = "next stage"
     const val GOLD_TITLE = "Gold field"
     const val GOLD_TAKE = "Take"
     const val ROLL = "Roll dice"
@@ -248,6 +253,7 @@ object CatanText {
                 !mine -> "$turn is playing…"
                 movingShip -> "Tap the sea edge to sail the ship to."
                 building == BuildKind.SHIP -> "Tap a sea edge beside your fleet or a harbour town to launch a ship."
+                building == BuildKind.RAID -> "Tap a pirate fortress your ship lies beside to raid it."
                 building == BuildKind.ROAD -> "Tap an edge to build a road."
                 building == BuildKind.SETTLEMENT -> "Tap an empty crossing to build a settlement."
                 building == BuildKind.CITY -> "Tap one of your settlements to upgrade it."
@@ -452,6 +458,7 @@ object CatanText {
                 movingKnight -> "Tap where the knight should go."
                 movingShip -> "Tap the sea edge to sail the ship to."
                 building == BuildKind.SHIP -> "Tap a sea edge beside your fleet or a harbour town to launch a ship."
+                building == BuildKind.RAID -> "Tap a pirate fortress your ship lies beside to raid it."
                 building == BuildKind.ROAD -> "Tap an edge to build a road."
                 building == BuildKind.SETTLEMENT -> "Tap an empty crossing to build a settlement."
                 building == BuildKind.CITY -> "Tap one of your settlements to upgrade it."
diff --git a/app/src/test/java/org/prolibertate/games/game/catan/CatanSeaExtrasTest.kt b/app/src/test/java/org/prolibertate/games/game/catan/CatanSeaExtrasTest.kt
index 700c3e9..f54e52f 100644
--- a/app/src/test/java/org/prolibertate/games/game/catan/CatanSeaExtrasTest.kt
+++ b/app/src/test/java/org/prolibertate/games/game/catan/CatanSeaExtrasTest.kt
@@ -165,4 +165,80 @@ class CatanSeaExtrasTest {
         val done = CatanRules.applyMove(after, 0, CatanRules.legalMoves(after, 0).first())
         assertEquals(CatanPhase.PLAYING, done.phase)
     }
+
+    // ---- Pirate Islands ----
+
+    private fun fortGame(): Triple<CatanState, Int, Int> {
+        val s = start(SeaScenario.PIRATE_ISLANDS).copy(
+            phase = CatanPhase.PLAYING,
+            resources = List(3) { Resource.entries.associateWith { 6 } },
+        )
+        val fort = s.terrains.indexOf(Terrain.FORTRESS)
+        val edge = (0 until s.topo.EDGE_COUNT).first { s.topo.edgeSea[it] && fort in s.topo.EDGE_HEXES[it] }
+        return Triple(s, fort, edge)
+    }
+
+    @Test
+    fun `nobody settles a fortress island until the fortress falls`() {
+        val (s, fort, _) = fortGame()
+        val corner = s.topo.HEX_CORNERS[fort].first()
+        assertTrue(SeaRules.fortressHolds(s, corner))
+        assertTrue(!CatanRules.vertexOpenForSettlement(s, corner))
+        val fort2 = s.terrains.indices.first { s.terrains[it] == Terrain.FORTRESS && it != fort }
+        assertTrue(s.topo.islandOf[fort] != s.topo.islandOf[fort2])
+    }
+
+    @Test
+    fun `a raid needs a ship beside the fortress and three cards, and three raids take it`() {
+        val (s, fort, edge) = fortGame()
+        val coord = s.topo.HEXES[fort]
+        assertTrue(CatanRules.legalMoves(s, 0).none { it is RaidFortress })
+        var state = s.copy(sea = s.sea!!.copy(ships = s.sea!!.ships.toMutableList().also { it[edge] = 0 }))
+        assertTrue(RaidFortress(coord) in CatanRules.legalMoves(state, 0))
+        val before = state.resources[0].getValue(Resource.ORE)
+        repeat(3) { state = CatanRules.applyMove(state, 0, RaidFortress(coord)) }
+        assertEquals(before - 3, state.resources[0].getValue(Resource.ORE))
+        assertEquals(Terrain.DESERT, state.terrains[fort])
+        assertEquals(2, state.sea!!.raidPoints[0])
+        assertTrue(!SeaRules.fortressHolds(state, s.topo.HEX_CORNERS[fort].first()))
+        assertTrue(CatanRules.legalMoves(state, 0).none { it is RaidFortress })
+        // Seat 1 has no ship there and cannot raid.
+        assertTrue(CatanRules.legalMoves(state.copy(turn = 1), 1).none { it is RaidFortress })
+    }
+
+    // ---- Wonders of Catan ----
+
+    private fun wonderGame(city: Boolean = true): CatanState {
+        val s = start(SeaScenario.WONDERS_OF_CATAN).copy(
+            phase = CatanPhase.PLAYING,
+            resources = List(3) { Resource.entries.associateWith { 9 } },
+        )
+        return if (!city) s else s.copy(
+            buildings = s.buildings.toMutableList().also { it[0] = CatanBuilding(BuildingType.CITY, 0) },
+        )
+    }
+
+    @Test
+    fun `a wonder needs a city, each stage is a point, and the fourth stage wins`() {
+        assertTrue(CatanRules.legalMoves(wonderGame(city = false), 0).none { it is BuildWonder })
+        var s = wonderGame()
+        val base = CatanRules.publicVictoryPoints(s)[0]
+        for (stage in 1..3) {
+            assertTrue(BuildWonder in CatanRules.legalMoves(s, 0))
+            s = CatanRules.applyMove(s, 0, BuildWonder)
+            assertEquals(stage, s.sea!!.wonders[0])
+            assertEquals(base + stage, CatanRules.publicVictoryPoints(s)[0])
+            assertEquals(CatanPhase.PLAYING, s.phase)
+        }
+        s = CatanRules.applyMove(s, 0, BuildWonder)
+        assertEquals(CatanPhase.GAME_OVER, s.phase)
+        assertEquals(0, s.winner)
+        assertEquals(s, CatanRules.decodeState(CatanRules.encodeState(s)))
+    }
+
+    @Test
+    fun `a wonder stage is not offered without the cards`() {
+        val s = wonderGame().copy(resources = List(3) { Resource.entries.associateWith { 0 } })
+        assertTrue(CatanRules.legalMoves(s, 0).none { it is BuildWonder })
+    }
 }
diff --git a/app/src/test/java/org/prolibertate/games/game/catan/CatanSeaScenariosTest.kt b/app/src/test/java/org/prolibertate/games/game/catan/CatanSeaScenariosTest.kt
index ee83e03..e2be5b1 100644
--- a/app/src/test/java/org/prolibertate/games/game/catan/CatanSeaScenariosTest.kt
+++ b/app/src/test/java/org/prolibertate/games/game/catan/CatanSeaScenariosTest.kt
@@ -43,6 +43,8 @@ class CatanSeaScenariosTest {
         assertEquals(listOf(1, 1, 6, 6, 6, 6), sizes(SeaScenario.FOUR_ISLANDS))
         assertEquals(listOf(1, 1, 1, 2, 25), sizes(SeaScenario.THROUGH_THE_DESERT))
         assertEquals(listOf(2, 13, 14), sizes(SeaScenario.FOG_ISLANDS))
+        assertEquals(listOf(4, 5, 18), sizes(SeaScenario.PIRATE_ISLANDS))
+        assertEquals(listOf(1, 3, 12, 13), sizes(SeaScenario.WONDERS_OF_CATAN))
         assertEquals(listOf(2, 3, 6, 17), sizes(SeaScenario.CLOTH_FOR_CATAN))
         assertEquals(listOf(2, 3, 5, 17), sizes(SeaScenario.FORGOTTEN_TRIBE))
     }
@@ -57,11 +59,12 @@ class CatanSeaScenariosTest {
                 for (h in 0 until topo.HEX_COUNT) {
                     val land = s.terrains[h] != Terrain.SEA
                     assertEquals("$scenario hex $h", topo.land[h], land)
-                    val unnumbered = s.terrains[h] == Terrain.DESERT || s.terrains[h] == Terrain.FOG
+                    val unnumbered = s.terrains[h] == Terrain.DESERT || s.terrains[h] == Terrain.FOG ||
+                        s.terrains[h] == Terrain.FORTRESS
                     assertEquals("$scenario hex $h", land && !unnumbered, s.numbers[h] != 0)
                 }
                 val deserted = scenario != SeaScenario.FOUR_ISLANDS && scenario != SeaScenario.CLOTH_FOR_CATAN &&
-                    scenario != SeaScenario.FORGOTTEN_TRIBE
+                    scenario != SeaScenario.FORGOTTEN_TRIBE && scenario != SeaScenario.PIRATE_ISLANDS
                 assertTrue("$scenario has no desert", deserts > 0 || !deserted)
                 // Under fog every hex is face down with no number; the tiles are in the pile.
                 val fog = s.terrains.indices.filter { s.terrains[it] == Terrain.FOG }
@@ -214,6 +217,8 @@ class CatanSeaScenariosTest {
         var fogFound = 0
         var clothPaid = 0
         var chipsTaken = 0
+        var fortsTaken = 0
+        var wonderStages = 0
         for (scenario in SeaScenario.entries) {
             for ((players, seed) in listOf(3 to 11L, 4 to 12L, 3 to 13L)) {
                 val opts = options(scenario, players)
@@ -232,6 +237,8 @@ class CatanSeaScenariosTest {
                 assertEquals("$scenario seed $seed", CatanPhase.GAME_OVER, state.phase)
                 if (scenario == SeaScenario.FOG_ISLANDS) fogFound += 14 - state.sea!!.fogDeck.size
                 if (scenario == SeaScenario.CLOTH_FOR_CATAN) clothPaid += state.sea!!.cloth.sum()
+                if (scenario == SeaScenario.PIRATE_ISLANDS) fortsTaken += state.sea!!.raidPoints.sum() / 2
+                if (scenario == SeaScenario.WONDERS_OF_CATAN) wonderStages += state.sea!!.wonders.sum()
                 if (scenario == SeaScenario.FORGOTTEN_TRIBE) {
                     chipsTaken += 4 - state.sea!!.chips.count { it != TribeChip.NONE }
                 }
@@ -241,5 +248,7 @@ class CatanSeaScenariosTest {
         assertTrue("no engine ever uncovered a fog hex", fogFound > 0)
         assertTrue("no village ever paid cloth", clothPaid > 0)
         assertTrue("no tribe chip was ever taken", chipsTaken > 0)
+        assertTrue("no fortress ever fell", fortsTaken > 0)
+        assertTrue("no wonder stage was ever built", wonderStages > 0)
     }
 }
diff --git a/docs/RULES-catan-seafarers.md b/docs/RULES-catan-seafarers.md
index 1b1cbbd..1c5ef98 100644
--- a/docs/RULES-catan-seafarers.md
+++ b/docs/RULES-catan-seafarers.md
@@ -32,6 +32,10 @@ Pick the map at setup; each scenario names where the starting settlements may go
 * **The Forgotten Tribe.** A 17-hex home island and three isles carrying four tribe chips. See *The Forgotten
   Tribe* below.
 
+* **Pirate Islands.** An 18-hex home island and two isles (five and four hexes) each held by a pirate
+  fortress. See *Pirate Islands* below.
+* **Wonders of Catan.** A 13-hex island with a desert, a 12-hex island, and gold islets. See *Wonders* below.
+
 A *new island* for the bonus is any island that is not a starting island for that map.
 
 The geometry is the same lattice as the base island, generalised (`Topology`): a hex is land or sea,
@@ -115,6 +119,26 @@ board). The chips are dealt at the start of the game, one of each kind in turn:
   A **gold** chip pays two resources of the settler's choice, taken at once like gold.
 * The chips come on top of the island bonus for being first to a new island.
 
+## Pirate Islands
+
+The author's reading of the scenario; the printed one uses knights and a roaming pirate fleet, which this does not.
+
+* A **fortress** is a land hex with no number and a strength of 3. Nobody may build a settlement on any crossing of
+  an island that still has a standing fortress. Roads and ships may go there.
+* A seat with a **ship beside** a fortress may **raid** it in its turn for 1 ore, 1 wool and 1 grain, as many times as
+  it can pay. Each raid takes one point of strength.
+* The raid that takes the last point **takes the fortress**: the hex becomes desert (no number, robber may sit there),
+  the island is open to settle for everyone, and the taker gets **2 victory points**. The robber never sits on a
+  standing fortress.
+* The island still counts as a new island for the first-landing bonus.
+
+## Wonders
+
+Also the author's reading. Every seat may build one wonder in four stages, once it has a **city** anywhere on the
+board. Each stage is one move costing cards (stage 1: 2 brick, 1 lumber, 1 grain; 2: 1 brick, 2 ore, 1 wool; 3: 3 ore,
+1 grain, 1 lumber; 4: 3 ore, 2 grain, 1 brick). Each stage built is **one victory point**, and the seat that
+builds the fourth stage **wins at once**, whatever the point target. Wonders are not shared: each seat has its own.
+
 ## With Cities & Knights
 
 Switching both expansions on plays [Cities & Knights](RULES-catan-ck.md) on any Seafarers map
@@ -138,7 +162,7 @@ Where the two meet, this game decides as follows:
 
 The physical expansion has more scenarios and the Catan Universe app adds more still. These are **out of scope here**:
 treasure islands, the oasis, the great canal, the Explorers & Pirates combination,
-the scenarios that need new rules (wonders, pirate islands) and trade ships.
+the printed rules of the wonders and pirate-islands scenarios (the versions here are simplified) and trade ships.
 A map-only scenario is a new text map and a new `SeaScenario` entry.
 
 ## How the AI plays it
@@ -146,5 +170,6 @@ A map-only scenario is a new text map and a new `SeaScenario` entry.
 It settles first and sails second. A ship is built when a settlement spot reachable by sea (up to five steps from its
 open end) is worth having, with a bonus for an island nobody has landed on, and ahead of a development card when that
 bonus is in play. A spot beside a village that still has cloth, or beside a tribe chip nobody has taken, is
-worth more (`CatanAi.scenarioLure`). It chooses the resource it values most from gold, always moves the robber (never the pirate) and does
+worth more (`CatanAi.scenarioLure`), a ship that heads for a standing fortress is worth building, and it raids and builds
+wonder stages whenever it can pay (`CatanAi.FORT_LURE`). It chooses the resource it values most from gold, always moves the robber (never the pirate) and does
 not sail ships it has already launched. See `CatanAi.shipValue`.