I have this game for my Xbox and its violence is very mild compared to other games. You can choose to be ether a robot( which are evil and trying to kill all humans) or humans,with are trying to protect themselves. There is no blood but you can send out a "Preyton" which is a flying humanoid robot with a sword that stabs,slices and dices the player you send it at. I think that any kid over 11 can handle this game.
What other families should know