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Fortress is about height. Each corner holds a square tower four layers tall, with a low wall joining them and a raised keep in the courtyard. It has 136 tiles, and more of them are buried under others than on most boards.
That depth is why it has one of the lowest win rates here. A tile at the bottom of a tower can stay out of reach for most of the game, so a wrong pairing early can leave you waiting on a tile you can't get to.
136 tiles over 4 layers, 12 tiles wide and 8 rows high. These percentages show how often a bot choosing pairs at random won, across 2,000 games at each level:
A thinking player will do far better than a random one. See how we measured this.
144 tiles · 4 layers
A stepped pyramid, and the main board on this site.
144 tiles · 5 layers
The traditional shape: a domed shell, side wings and one tile on the peak.
144 tiles · 4 layers
Two big towers joined by a narrow two-row span.
144 tiles · 3 layers
Tapered wings either side of a tall, narrow body.
144 tiles · 3 layers
Four arms meeting at a raised center block.
72 tiles · 3 layers
Half the tiles of a full board. Quick games with larger tiles on phones.
96 tiles · 3 layers
A flat bed with three raised mounds. A shorter game at 96 tiles.
144 tiles · 3 layers
Three broad steps climbing to one side. Few free tiles at the start.
136 tiles · 4 layers
Tapered rows forming a diamond. The most forgiving full-size board.
The rules, from your first pair to clearing the board.
How traps work, and how to avoid getting stuck.
Every tile, what it means and what it matches.
Every board compared by size, shape and difficulty.
Our data from 80,000 simulated games.
One new board a day, the same for everyone.
Fortress has 136 tiles over four layers. It uses a selection from the full set, so every face still comes in matching pairs.
Its four tall towers bury a lot of tiles at once. With so many covered, you have less information and fewer safe choices for much of the game.