Man people think "" was the first First-person shooter game to have health regeneration, but it was not. Health regeneration was not even in the first "Halo" game, but it was added in "Halo 2" and was a feature in most "Halo" games since then. Even so, it has existed in shooter games before "Halo". Nonetheless, since "Halo 2", it became more common to have have health regeneration instead of health bars and it later became standard in shooter games. Other shooter games that use health regeneration include the "Call of Duty" games, the "Gears of War" games, and the "Sniper Elite" games.