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Twin towers and a keep, with a raised battlement over the gate. Plan your layers early.
The castle is a full American Mahjong deck — all 152 tiles. The two side towers are pure single-layer columns, so they drain fast from the edges, but the keep is a dense 8×12 block with 16 stacked battlement tiles dead center. The battlement is the whole puzzle: every row under it is buried, so match battlement pairs as soon as they appear, or the gate tiles will sit unreachable for the rest of the game.
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