Tap to rotate tiles. Try to make closed loops which will score and be replaced with new tiles, possibly causing a cascade effect. Both games are free-to-play. No in-app purchases.
Every time you rotate a tile that does not score you loose a Move. The game ends when you have no more Moves.
Larger loops score more than smaller loops. Bonus moves are awarded for very large loops where you flip more than 15 tiles in a single move.
Watch the progress bar for Level advancement. Every time you go up a level the game board is refreshed with all new tiles.
The square game is much easier than the hex game.
In the hex game you are not penalized for rotating a tile more than once.