Demiforce Trism for iPhone

Trism's slight tweak on the Bejewled game play is so profound that it changes the way you have to think about puzzle gaming. The basic premise, as with most puzzle games, is really simple. You have rows and columns of mutli-colored triangles. You slide them around to line at least three up and clear a space. The twist? The iPhone can detect which way you are holding the phone and drops the triangles into recently filled holes from the proper direction. So now you have to think carefully about which way to hold the phone before making a move. The fun basic play is backed up by three game modes, 22 unlockable achievements and an online international ranking board (I'm currently number two.) They even included a colorblind mode. One of my favorite iPhone games so far.