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15 Puzzle

Slide the numbered tiles back into order. Four board sizes from a gentle 3×3 to a brutal 6×6 — every scramble is guaranteed solvable.

How to play: tap any tile in the same row or column as the empty slot — it slides (with everything between) toward the gap. Arrange the tiles to read 1, 2, 3… left to right, top to bottom, empty slot last. You can also swipe the board in a direction to push a tile; arrow keys work on desktop.