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 change the screen orientation in a cooperative game from horizontal to vertical, enter
the Xbox console settings and change the video to widescreen. On a regular display, this
will change the splitscreen from horizontal to vertical.

Go to the Colossus arena and have player two stand next to the middle conveyer belt, and
player one stand on the platform that shoots you upward and remain still. This will work
with energy swords or any other heavy weapon. Have player two hit a barrel on to the
conveyer belt and watch it fly up. Have player one lines himself up with the barrel and
hit it with a melee attack.

When battling with Elites, do not hit them once with your weapon. Always hit them
multiple times. If you hit them once, they will have a faster time and kill you with one
hit or take down your shield. Additionally, an easier way to kill Elites quickly is to
double-wield the SMGs and aim for the head. Be careful, as the SMGs tend to send the
reticle upward. Also, try meleeing him before using the double strategy.

You can outsmart Elites in some battles by finding cover and returning fire as usual.
However, when they stop firing, relocate to other sources of cover and have a few seconds
before they notice. Also throw grenades before they get all the way out, if they are
appearing from a door or a ship portal.

Dual wield a plasma pistol or rifle and a Human pistol. Use a plasma pistol or rifle to
knock down the shields quickly, and then shoot them in the head with the magnum.

Go to Metropolis level (easier in co-op mode). Go in the middle of the bridge where the
Banshees come from. From there, the Banshees should attack you. When this happens get in
it (knock them out). Fly the Banshee down to where the Covenant ship is located. Have the
other player take out the guns on it. Once the guns are destroyed, jump off the Banshee
above the Covenant ship. Stay on it. It should take you to a flat surface that in the
distance where there are buildings. You can walk through them.

To easily take down Royal Guards (red Elites with strange helms), attack them with the
energy sword. Do not be afraid -- keep slashing. They will fall after about three hits.
Note: If it has a energy sword, you must get the first hit or it can kill you with
one shot. Do not let their armor fool you -- they are still Elites. Knock down the shields
with a plasma weapon, then shoot them in the head with the pistol.

Piggyback on a Banshee. Before one member of your team gets into the Banshee, jump on top
of the Banshee's pilot cover. When you get in, you can just stand on top of it. Only make
turns with the Right Analog-stick. They are slower and do not tilt the Banshee. More than
one player can stay on top of the Banshee. This provides extra fun if you want to do
aerial tricks with friends by jumping from Banshee to Banshee.

Have two dual-wieldable weapons (for example, a Needler and an SMG), but do not have them
out at the same time. The Needler would be the weapon that you want extra ammunition for.
Have the SMG out and find another Needler to dual wield with it. Then, find yet another
Needler and trade that with your SMG. You will now have three Needlers, and have three
times the ammunition.

There is a platform by the "Ferris wheel" that has an object that resembles a switch.
Melee it or shoot it, and it will blow up after a few hits. The platform will fall, and
you can now walk into the middle of the "Ferris wheel".

While in a multi-player game, press D-pad Down. To other players, you will have your
weapon lowered or down to your side. This may help if you are on your own turf and run
into one of your friends right around the corner. Additionally, you can hold your gun down
by making sure you have no grenades. After tossing them away, hold L and you will hold
your weapon down. You will not notice this on your screen, but other people will see you
do it. This does not work with the beam sword.

Get in a side seat of a vehicle (Spectre or Warthog) with a plasma pistol. Charge the
plasma pistol and get out. The gun will be shaking as if it is still charged.

With big groups of enemies, kill off the Grunts first, as they are easier to kill and
become less of an annoyance. Additionally, two slashes with the plasma swords are good
against Grunts. However, hitting them with the grenade launchers three times can kill just
as easily and does not use any ammunition.