I managed to pick a copy of the game up for £20 from
GAME, half the price of a normal game, it' s very cheap, don' t know why, anyway the game does not support live play, you can download a little level, and the point of it is to kill as many enemies as you can, and your score is then uploaded to live, I think they will release more levels soon, there are 3 modes to play to, light, medium and heavy, but it' s all offline, just a hack and slay fest, I managed to kill 81 enemies, which got me 41st place out of 88 people.
The single player mission is awesome and for £20 about $30 the game is a bargain, it' s released this friday in the UK....so grab it while you can,..
You can check out my review of the single player mission
here It even plays in Widescreen!!!