Click on a tile to select it, then click on a matching tile to remove the pair. Tiles are 'free' (selectable) only when they have no tile directly on top and at least one of the left or right edges is exposed.
Continue clearing pairs until the board is empty (you win) or no valid moves remain (you lose). Use hints if you get stuck.
Plan Two Moves Ahead - Removing a pair changes which other tiles become free; thinking about what unlocks helps avoid dead-ends. Clear the Top Tiles First - Tiles at higher layers are blocking everything below; clearing them often opens many tiles at once.
Leave Easy Pairs for Later - When multiple identical pair options exist, save the most accessible for emergencies and clear the harder-to-reach ones first.
Use the Hint Sparingly - Hints often show the easiest pair; if you're chasing high scores or the satisfaction of self-solving, save hints for genuine stuck moments.
Watch for Dead-End Quartets - When all four tiles of a single design are still on the board and only two are free, removing those two leaves the other two unreachable; sequence matters.
