Cronk is an interesting game for the iphone and ipod touch. It's a mix between a tower defense game and a bejeweled-like game. The basic idea behind the game is to eliminate the boulders rolling down the path towards your village. To do this, you need to match similar colored rocks by throwing them. If a match of three or more is made, the boulders are destroyed. There are plenty of special boulders to hit that will affect your game as well.