Fill the whole game's board with one color. You start from the bottom left corner and progress by selecting one of the colored buttons on the top of the screen.
When you select new color, every adjacent field with the same color also changes, that way you can fill whole board with your color.
Select from 2 game types.
"Puzzle" game - you need to fill game board with one color. You are getting more points for bigger group filled in one step, build bigger groups to earn more points.
"Strategy" game is similar to "Puzzle", but you have limited number of steps to finish the game.