http://www.joystiq.com/2012/10/04/happy-wars-free-for-all-is-free-for-xbox-live-gold-starting-oct/
Not saying it's anything ground breaking. Has online multiplayer and seems a decent hack n' slasher.
Saw it on 360 XBL last night and it's totally free. Thought the few 360 owners around here might be interested.
Thanks for the heads up, didn't realise it was a freebie. I know there's another Kinect one that's free, but I'll grab this too.