15

The 15 puzzle, ported from wasp-os's puzzle15. Slide the tiles into order, 1 to 15, with the gap in the bottom right corner.

Using it

• Swipe left, right, up or down to slide the tile beside the gap that way into it.
• The top left counts your moves; the top right shows your fewest moves to a solution, once you have one.
• Tap to ask to deal a new board: the question names your moves so far. Tap Yes to deal it or No to carry on.
• A solved board buzzes and says Solved in and the move count, in green. Swipes then do nothing; tap to deal a new board straight away.
• The board, the move count and the best are kept for next time. The first opening deals a random board that can always be solved.

Screens

A freshly dealt board, before the first move.

Two moves in, after swiping right twice slid the 12 and then the 7 across into the gap.

The question a tap asks before dealing a new board, naming the two moves made so far.

The board solved in 52 moves, which is also the best so far.