The most recent game in the Worms series. Many argue that Worms 2 was a better multiplayer game, but few would deny that WormsArmageddon
is a much better single player game. The addition of training missions, deathmatches, and interesting missions make it a great game, even if you want to play alone. The options of internet and network gameplay also add a lot to this game.
I've also seen mention of StripWorms? and DeathWorms? on Wiki, though I've never actually heard of either variation being played. Yeah... they've been played. Trust me.