cheat codes

I am not sure which scene you are talking about but I think you are thinking of the scene with the gravity beam into the ship? You don't need cheats to beat that scene. Here is how I did it: 1. After you kill off the other troops with a plasma turret (the stationary ones), then two hunters drop down. 2. Get out of the turret, because the hunters shield blocks the bolts. 3. Hopefully, you still have a few marienes left and a sniper rifle with a few shots left. Try to run behind the hunters (while they are distracted by the marines) and shoot them in the orange midsection; they should die immediately, but I don't know because I use a sniper rifle. I don't think there are any cheat codes to HALO Combat Evolved, but there are mods and cheats for HALO Custom Edition.