Halo: Combat Evolved Cheats

Alright. First you gotta go to Blood Gulch with ghosts turned on. Then go in front of the red base a little with a ghost on the first hill. Aim towards the blue base. Start starfing right without changing where you are looking. If you get out just before you hit the wall at the slanted part get out and the ghost should push you up the wall. You will then be on top of the level. You will know you are up when you get the because you will be standing on nothing but still be able to see the level. It helps to bring a sniper. Watch out though cuz your friends can still see and shout you if you don't hide behind the peaks and rocks.

You can bring a ghost up there too. You can blow it up there with a partner using rockets and grenades or you could do it the easy way. First put a ghost up the wall where I told you you could get up before. Have it all the way on the wall facing the ground. Then get a different ghost and be far away and then start floorin it towards the ghost on the wall. Start holding A to lift up the front end. If you get it right you should start "driving" up the wall. Keep pressing foward until you reach the top of the level.

When you're really happy because you just beat a hard level, get 2 plasma grenades. Throw one after the other. If done correctly the first one will launch the other into the air and it will explode. It's similar to Fireworks.

In Multiplayer mode choose a course with Warthogs. You will need 3 players. When your opponent is in a Warthog make him drive in front of you. Make sure they have a gunner. Throw a plasma at the gunner and wait. In a while the plasma grenade will explode and the gunner will fly temporarily.

sometimes they wont be fully shielded like when they move around or when they shake their fist like an old granny, but when fully shielded to kill them without a sniper or using a melee attack you could, with any weapon exept rocket launcher or sniper, shoot the gun in their hand or their feet then shoot their body a couple of times.

Double Punch
While in gameplay, press the melee button (hit), then quickly throw a grenade, then quickly melee again. The entire process should take one about 1.5 seconds to do this.

Marines Hate You
On any Campaign Mode level, ( co-op or single player) just start attacking The Marines. Sooner or later, they will start to fight back, and when you target them the crosshair will be red.

Skip part of Silent Cartographer.

When you unlock the door to the cartographer place, You will fight invisible elites.
After that, go outside, look right and you will see some overshields. Get one and jump from the ledge towards the downed pelican(With rockets) you will fall, lose your overshield, but not get hurt. there will also be a warthog to hop in.