Yea there are some differences but; Sword and hammer are in halo Person who picks up the OP weapons or invis/overshields owns every one else Halo sword uses same mechs as arc blade regarding dash melee Halo hammer uses same mechs as fist of havoc Halo personal shield field = ward of dawn Halo 3 story (cortana goes nutz that one idk if 3/4) story is told same way as destiny with a few cutscenes but mostly cortana blabbing while you fight instead of ghost blabbing while you fight Stuff like that Also YOU CAN AIM ANY HALO GUN UNLESS DUAL WIELDING! READ GAME MANUAL