Successfully complete single player mode on any difficulty setting to unlock the Foundation multi-player map. Note: There is a glitch that prevents some people from unlocking the map as it was originally intended. The way it has been done successfully is as follows: Successfully complete single player mode on any difficulty setting. Create a new profile. Begin a co-op game on the last level with the newly-created profile with the second player. When you reach a section where you fly a Banshee, the new profile must perform a barrel roll and a loop-the-loop. Finish the campaign and the new profile can access the Foundation map when hosting split-screen, System Link, or Xbox Live games. Alternately, if you have Xbox Live, go to the Microsoft Content download menu. Then, download all recently updated content. Go to a game menu. Go to change the options, then change the map. It should be at the very bottom.
This trick requires levels that have either Covenant or Marines following you. If you have a powerful weapon that has very limited power (for example, the energy sword, or Covenant sniper), or weapons that are very powerful (for example, Human sniper or rocket launcher) give them to the A.I. following you. As they use them, the weapons will never run out of power or ammunition. Also, they can use them very well.
To do this trick, your weapon must be reloadable and have at least one clip in it. When your weapon has no shots remaining, before you reload, switch to your other weapon. Find an ally that you can switch weapons with, then quickly switch to the weapon that needs to reload and swap with the ally. If done correctly, you will see your ally reload the weapon. Swap your weapon back to see that your clip is now full, and it did not take away any ammunition.
This trick can only be applied to weapons that can be dual wielded. For this trick to work, you need four dual wielding weapons in one place. Two or three weapons of the total four weapons must be the same, but remember a minimum of two of same weapon is necessary in order to have same weapon for both primary and secondary slot. For example, have two needlers, an SMG and a plasma rifle. To get two needlers, carry one needler as your primary weapon then select anything else but the needler (such as the SMG gun) as your secondary weapon. Note: You cannot select the same weapon as your secondary any way. Dual wield plasma rifle with the SMG then go to the needler that is on the ground, hold X, and substitute the second needler with the SMG gun. Then, throw the plasma rifle away by pressing B. You are left with the Needler as both your primary and secondary weapon.
You can use a destroyed machine gun; for example, in Zanzibar after you fire a rocket to one of the turrets on the left and right on the main base. Just go back to them and the screen will prompt you to hold X to operate. This can be useful during heated sessions.
Wait until a Banshee drops quite low (but you still cannot reach it). Jump before doing it. If it does not say “Hold X to board enemy Banshee”, press X regardless. You might not see Master Chief leap up and hit the Elite (or other alien) out of the Banshee. Do not go too low, and drive slowly because the Elite might kick Master Chief out.
Go near a Wraith and press X. Then, press B a few times. Instead of throwing a grenade, just hop in. If this does not work, throw a grenade in the Wraith.
When in a Banshee, press A and a direction on the Left Analog-stick. When in a Banshee, hold A and press Left Analog-stick Down. The Banshee will do a backflip. Additionally, to do tricks in a Banshee, press Left or Right on the Left Analog-stick and hold A to do a barrel roll, or hold Down + A to do a loop.
In multi-player-mode, turn on all vehicles and go to a place with open space. Get in a Ghost and find a tank. Go towards it as fast as you can. You will flip and do different things, depending on where you hit the tank.
Go to any level (Metropolis recommended, when you have to get on the Scarab). Back the Ghost up to the side of the bridge. It will start hopping up and down.
Chose a level with the yellowish glowing boxes that blow up (Headlong or Waterworks recommended). Get in a ghost and boost into one of the tiny boxes and you will be sent flying. You can repeat this as many times as desired, or you can pile the boxes and be blown sky high.
When using a Spectre, go at top speed and hold A. You will do a wheelie for about three to four seconds. This is useful when climbing up walls or going over short walls.
