The goal of the game is to clear the board by setting all tiles to red. When you tap a tile the tile itself as well as the adjacent tiles cycle through 7 different colors.
There are 3 different game modes (Classic, Unlimited, and Hardcore).
Classic mode has a maximum number of moves allowed per level. If you run out of moves, the level regenerates. At the end of each level, your score will increase by your leftover moves.
Unlimited mode has no score, but you have an unlimited number of moves per level.
Classic and Unlimited modes have their own separate save file, so you can enjoy both modes at your leisure!
Hardcore mode - no saves, no resets, no regens!