This demo is very limited but it can give you a good idea of what the full version is like. I'm a big fan of the original Worm games and this 3D adaptation of the game is very nicely done.

Check it out on thier official site

Ok this isn't really multiplayer but I suppose you could alternate levels with a friend. Worminator 3 is a cool Duke Nukem side-scroller clone with a crazy Worms theme. If you like the old school side scrollers give it a try.

Thanks Bluenews for the crazy link.

Team 17 is at it again with another sequel in the Worms Universe (that brings up some mental pictures, doesn't it?) Worms 3 is actually the 5th Worms game to hit the scene. There was the original Worms, Worms 2, Worms Armageddon, and Worms World Party.