Mahjong Solitaire — Fortress
The fortress lays a solid 96-tile floor, walls it in with a 28-tile curtain, adds four corner turrets and a keep in the middle. The two long runs of the wall are the puzzle: every tile in them has a neighbour on each side, and a turret stands on the tile at each end, so a turret has to come off before anything along the top or the bottom of the wall can move at all.
New layout builds a fresh solvable board, Hint flashes a matching pair, and the three-dot menu holds the shuffle, which rearranges the tiles you have left without ever making the board impossible.
Your statistics
- Played
- 0
- Won
- 0
- Win rate
- 0%
- Streak
- 0
- Best streak
- 0
- Best time
- —
- Tiles
- 144
- Layers
- 3
- Shape
- 96 floor + 28 wall + 16 keep + 4 turrets
- Solvable
- Every deal, by construction
Why is the wall the hard part?
Because of the free-tile rule. A tile needs one long side completely clear, and a tile in the middle of a straight run has a neighbour on each side. All ten tiles along the top of the wall are blocked at the start — the eight in the middle by their own neighbours, and the two on the ends by the turrets standing on them. Take a turret and the run underneath starts unzipping from that corner inward.
That gives the fortress a distinctive opening — thirty-eight free tiles, and not one of them a corner. The four turrets are free; so are the short side runs of the wall, which are single columns with no left or right neighbour at all; so are the left and right columns of the floor and of the keep, and the keep's four top tiles. The corners are the tiles under the turrets, and they are where the long runs finally open, not where you start.
How should you open a fortress board?
- Take the turrets early. They sit on the wall corners and removing one frees the corner beneath, which is the only place a long wall run can start unzipping.
- Unzip both ends of a wall run rather than one. Working from a single end means every removal exposes exactly one new tile; working from both doubles your options.
- Leave the floor alone at first. Only the sixteen tiles in its outer two columns are free anyway, and they stay free all game — the wall and the keep are the tiles that can strand you.
- Watch the keep. Four tiles sit on a twelve-tile block and cover six of them, and the block itself covers part of the floor.
Is the fortress solvable?
Every deal, yes. The board is not shuffled onto the slots and checked afterwards — it is built by starting from a full board of empty slots and repeatedly assigning a matching pair to two slots that are both free in the same position, then reversing that removal order. Random tile assignment produces unsolvable mahjong boards roughly a third of the time, which is why so many implementations feel arbitrary.
Fortress mahjong questions people ask
- Why can't I click a tile in the middle of the wall?
- Because it is blocked. A tile is only free when at least one of its long sides is completely clear, and a tile with neighbours on both sides has neither — even though nothing is stacked on top of it.
- Is the fortress layout harder than the turtle?
- Yes, but not where you would expect. It opens wider than the turtle — thirty-eight free tiles against thirty-five — and then stays tighter than it for the rest of the game, because a wall run releases one tile at a time from each end. The floor underneath is very forgiving once you reach it.
- What happens if I run out of matches?
- Shuffle redistributes the remaining tiles over the remaining slots using the same guaranteed-solvable construction, so the board is playable again. The counter above the board records how many shuffles you have used.
The full rules
Every layout shares one rule set. The complete version, including exactly what makes a tile free and why flowers and seasons are the odd ones out, is on how to play mahjong solitaire.