Classic
Original rules of the base game.
Logic / 12 modes
Fifteen Puzzle
Put every tile in its place, one thoughtful move at a time.
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One game. Several approaches.
Serpentine goal
Arrange tiles along the displayed serpentine target.
Spiral goal
Arrange numbers in a clockwise spiral from the top-left corner inward; the empty cell ends the spiral.
Column goal
Fill columns with numbers top to bottom, from left to right; the empty cell belongs at bottom-right.
Row slide
Click a tile aligned with the empty cell to slide the intervening row or column in one move.
Odd and even
Arrange ascending odd numbers first, then ascending even numbers, ending with the empty cell.
Memory
Study the board, then hide its numbers with Ready. Slide adjacent tiles from memory; another peek costs five moves and marks assistance.
Cyclic shifts
Select a cell, then a direction: its entire row or column cycles one position in one move.
Fixed tile
The top-left tile is fixed. Arrange the others by sliding tiles adjacent to the empty cell.
Sliding pipe route
Slide path tiles without rotation. Connect S at the top-left to the marked T, including both end ports.
Two empty cells
Slide a tile into either adjacent empty cell. If both qualify, the lowest-index empty cell is used.
Paired blanks
Two colored blanks accept only their matching tile type.