The 15 puzzle is a sliding puzzle that consists of a frame of numbered tiles in random order with one tile missing. The goal of the puzzle is to place the tiles in order by making sliding moves that use the empty space. Features: ✓ 6 game modes. ✓ 6 puzzle sizes. ✓ Daily World Cup. ✓ Personal and world statistics. ✓ 36 attractive and varied tile skins. ✓ 20 desktop skins to any taste. ✓ 7 different tile shapes.