Remove all the tiles to win! How you can remove the tiles? You can remove pair of tiles of the same figure by selecting them.
But you only can remove them if tiles have one of their side left or right free of other tile or do not have other tile above of them.
[Undo]
Remove some tiles you don't want to, no problem, press the undo button to undo your last movement.
[Hint]
If you get stock and want help, you always can press the hint button and show you what tiles can remove.