Click the arrows to scroll a row or column along. Match 3 or more tiles of the same colour for points and stuff.
Infinite Mode fills in any removed tiles with randomly picked new ones. There is no win condition, but you’ll lose if you move 4 times without a match.
Elimination Mode doesn’t fill in removed tiles and tiles will fall into gaps. Win by clearing the whole grid (not actually always possible, expecially on smaller levels). Lose by not doing that.
Choose your grid size on the title screen.