The sliding tile puzzle

sTile is a sliding puzzle that consists of a frame of numbered square tiles in random order with one tile missing. The goal is reorder all tiles properly while the empty place must be in the bottom right.
To move a tile, simply tap on it; the only tiles you can move are those next to the hole. Puzzle sizes are 3x3, 4x4, 5x5 and 6x6 (touch and hold). Train your brain with sTile!