It's a lame game. The object of Trism is to match three or more triangles. The triangles have to be the same color and they have to touch be touching on the sides of each other (not the points) in order to create a match.
Michael is the first person I've heard voice dissatisfaction with Trism. It's a whole lot more than Bejeweled but the same basic idea. The new one in the App store has 3 different game modes. It is very addictive and challenging.
Check out the YouTube demo on Trism,
EDIT I know this should be in the App forum but I did a quick search to avoid double posting. I didn't realize I was posting on top of something in the mod forum.
This is my favorite game on the iPhone. Just like everyone else said, it is very addicting =] Its crazy how hugh people can get their scores. My friend got lucky and got a combo that gave him like 517 million points.
I have to agree with most, Trism is the best game I have. I cant put it down. The trick is to master the sidelines and set up huge combos off the screen, then drap em onto the screen and get tons of points.