 Halo : Combat Evolved Anniversary and the original , Halo : Combat Evolved , are identical in gameplay and plot . The game is a first @-@ person shooter with portions of vehicular combat taking place from a third @-@ person perspective . The plot follows the player character and protagonist Master Chief , a supersoldier , as he fights the alien Covenant on the mysterious ancient ringworld Halo . Players are equipped with a recharging energy shield that absorbs damage ; players also have health that can only be replenished by health packs scattered across the game 's levels . A variety of human and alien weapons and vehicles can be used . 
