Please don't take my review lightly, as it may have some points you agree with.
This app store FPS (first person shooter) shows non-stop violence, and guts and blood shoot out for just a split second when an alien is shot. Kill that B****rd is said repeatedly and annoyingly, and so much I had to mute my laptop, because I was so annoyed. The game can get somewhat difficult and boring, and on the computer can get very hard to control. But otherwise, if your kids are not bothered that badly and want Halo but your not budging, then heres an OK game for an cheap price.