Everything is definitely more detailed than the previous halo game. The flood has new forms and are harder to kill. In Halo 3, the carrier flood carries more flood than the last two games and there is this new form that looks like a spider. It can merge with biomass to become a big flood that is quite hard to kill. Only hits in the face against this kind of flood are effective. The new weopons are the mauler ( a brute shotgun-like weapon), Spartan laser, spiker and Gravity Hammer. There is new granades in Halo 3, unfortunately, a player can only hold 2 at anyone time. The granades are plasma granade, fragmentation granade, spike granade and fire bomb granades. There is also equipment that you can use. Regenerator, bubble shield, tripmine, gravity lift, radar jammer, power drainer, deployable cover and camouflage are some of them. The new vehicles are the brute chopper, mongoose, prowler, elephant and hornet. The banshee fuel rod cannon is now available in multiplayer mode. Turrets now can be ripped of from its stand. The new turrets are flame thrower and missle pod. The assult rifle and the fuel rod cannon are also back however, the assult rifle can only hold 32 rounds instead of the original 60. I also found out how to make stuff fly in the the air. I learnt this from a friend of mine...and by the way, the brute plasma rifle is missing.