Move the colored squares in the grid by dragging those on the empty squares, you can move all the squares in every direction which are closed to the empty square (Up, Down, Right and Left).
You can enjoy more than 200 levels of every difficulties, from basic to complex !
Also 3 extra modes are available but will be unlocked with the square points that you will acquire by completing the different levels :
-Random : Play with a random level
-As many as you can : Complete as many levels as you can in a time trial mode.
-Beat the Black : Complete as many levels as you can before a black square hits an empty square.
The game will keep track of your best performances, so you can always try to beat your own records !