Mahjong solitaire. Order is everything.

Choose a tile, then another with the same face, and the pair lifts off the pile. Only a free tile can be taken: nothing may rest on top of it, and either its whole left side or its whole right side must be clear. A tile with neighbours on both sides is walled in even though nothing is on top of it.

Every board takes exactly half its tiles in removals, however well or badly you play it, so there is no shorter line to find. What there is to get right is the order: most faces are laid four times, so a tile usually has more than one possible partner, and taking the wrong two can bury the others.

Nothing here can be lost. A board with no pair left to take is stuck, not finished — take a pair back and it opens again. Undo goes back as far as you like, and Reset starts the board over.

The three layouts ask different things. A terrace is flat and open, so almost everything is reachable and the trap is spending the faces you will want later. A pyramid buries its middle, so the order has to uncover before it can match. A bridge is two banks with a deck across them, where a tile is often held not by what is on it but by what is beside it.

Tab reaches every free tile; arrow keys move between them, Enter or Space chooses one and then its match, and Escape puts a chosen tile down again. Each tile says its face aloud — Dots 3, Bars 6, Rings 1 — so the pile can be read without seeing it.

A cleared board is worth 100 points. Because every board takes the same number of pairs, moves cannot tell two players apart and nothing is deducted for wandering; the best attempt on a board is simply the quickest one.

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