Half-Life came out in 1998, Halo came out in 2001.psicat said:But wait a minute wasn't Half Life 2 also basically just a rip off of Halo: Combat Evolved. They are both FPS with non regenerating health. Both have silent protagonist in a power suit is the only one who can save humanity from the aliens, along with his perky female companion. And, of course both game titles start with an H, so Valve must of copied Bungie, and in turn they now get copied by Insomniac.
Resistance did come out more recently, but it's more like them to have ideas copied from them, not by them. Before Painkiller had one gun that shoots shurikens and lightning, Insomniac already had lightning guns and shuriken guns.