Worms is a good turn-based strategy game.  Where the environment is destructible and your worms use weapons of war to destroy each other.  They die when their hitpoints fall to zero or they fall in the drink (water).  You get 4 worms on your team and you can have up to 4 teams of 4 playing a match.  Try downloading the demo to see how you like it.
It takes a little getting used to but it is entertaining.

i will get this game!