Play in co-op mode in any level (Outskirts recommended). Have one player jump on top of
the other. Then, have the player on top jump again and keep pressing Jump. Then, have the
lower player jump immediately after the first player. If done correctly, the top player
should land on the lower one (who is in mid-air), then jump again. You can use this to get
on top on locations you cannot reach normally.

Make a new Slayer game, and set the active players to two. Leave most selections at
default, except turn off active camo and overshield. Set the starting weapons to the
battle rifle and the shotgun. Turn off all vehicles except for two Warthogs, and turn off
gun emplacements. Turn on teamplay, and turn off team switching. Set the betrayal penalty
to 5 seconds. Play at Coagulation. This should allow you to have eight teams of two people
each, making for some really fun teamwork games. If it does not, play with the active
players setting until it works.

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.

While holding the shoot trigger, press Melee, and immediately after the hit, press X
(which instantly continues you back into shooting). Note: This can be done as long
as you do not overcharge the plasma rifle.

Have the sword when an enemy is very close. You can jump and do it, or run and jump to
them, then press B. This is a one hit kill for Flood, and a two hit kill for some Covenant
and the shield Flood.

With almost any vehicle, you can get a piggyback if you are not skilled at driving or need
a fast ride when someone on your team is already on a Ghost. This also works with the
Scorpion, Banshee, and the Warthog when you have someone in the gunner seat, when you are
all far enough away from the enemy.

Throw a grenade on a conveyer belt. It will stick to the ground, but not move with the
conveyer belt.

To get the sword in the middle (if it is on) go to the Ferris wheel-type object in the
middle. Line up with one of the blades. Let it push you up the circle until it is parallel
with the floor. Then, run forward to the center of the circle. Jump down so that you can
see through the center of the "Ferris wheel". Wait until a gap appears in the floor, then
jump down and forward to the sword. Additionally, you can get the energy sword faster by
shooting a rocket or grenade at the front or back of the bridge that is standing up. It
will fall down and lead you directly to the sword.

Starting at the beach, run along it and then left into the opening (get a Ghost if
desired). Upon arriving at the giant wheel in the center of the map, you will see the
sword shimmering in the center of the structure. Toss a grenade or blast a rocket inside
the little space where the sword is kept, and it should fall out and onto the ground
before you. This is especially useful if you spawn at the beach, because the other team
will not have a chance at getting the sword before you.

Get a Plasma Sword from a dead Covenant Elite and get close enough to the Flood for the
half-circle surrounding the crosshairs to turn red before attacking. You will lunge
forward and kill the enemy instantly, sometimes killing two or even three if they are in
close-enough proximity to the target. This attack only uses between two to five ammo
points, so it can be repeated at least twenty times. Note: Do not use this trick on
either the small spider-like Flood or the large bulbous Flood, as the explosion that
follows will damage your shields. Additionally, to kill the Flood easily, use the sword.
It cuts right through the Flood in one shot, unlike any type of plasma gun.

To make fighting Flood easier, use a shotgun and an energy sword. The Flood levels are
mostly close quarters -- shoot them in the face with a shotgun. This will take down even a
shielded Flood in one hit. Then, use an energy sword to vaporize the bodies so that they
cannot get back up. The best part is that it will not use any energy sword power.

You can actually kill the human and elite Floods with one shot of the Covenant carbine.
Aim directly at the stomach for the human-type Floods (with no long tentacles in their
left arm); and aim high in the middle where the head would usually be for the Elite-type
floods (with the long tentacles).

When you are playing the Outskirts level, Sarge will come along, but he is invincible. You
can use him to your advantage. If you are playing under the legendary difficulty setting
and your shield is down, stand behind him when he is shooting Covenant. This should give
you some time to restore your shield. Also, he has infinite ammunition. If you find a very
good gun but are very low on ammunition, give it to Sarge.

When playing in co-operative mode under the legendary difficulty setting, get a grenade
launcher that is left over from the Brute on the bridge. When Tartarus jumps onto the
spinning disks, jump onto the platform with your partner, then jump on the three disks for
safety. Let your partner have a carbine rifle on the top level and have him snipe
reinforcements when they arrive. Run around the middle circle, waiting for Tartarus to
lose his shield from Sarge sniping him. Hit him with your grenade launcher. Hit him three
times, then run away and wait. His reinforcements may appear. If they do, camouflage and
run to the top level. Allow your partner to kill the Elites. Camouflage if Tartarus or
Elites come to the top level. Note: Use your Brute plasmas if you run out of
ammunition. There are some on the middle level, and perhaps the bottom level. Make sure
your partner conserves his carbine rifle ammunition. Never fight a Brute Elite, as they
will kill you in a few hits. Also, never hit Tatarus with a melee attack. Never use
grenades as Tartarus will just jump. The most important thing is to not allow your partner
to die. When doing this in single player mode, use the same tactics except when Elites
arrive, camouflage yourself then go to top level and snipe with the carbine rifle.

When the intermission sequence ends, do not rush towards Tartarus like the others.
Instead, just wait until they all jump to the other side, then jump over there. Or, you
can wait for the moving platform to help you get to the other side. After you have done
that, Tartarus will have a sort of "fog" around him. Get a plasma gun. Note: If you cannot
find one, go to the lift, and on the top floor behind a wall there should be a box from
which you can get one. Dual wield the plasmas and fire at him until the fog goes away.
Then, keep shooting at him with the plasmas until he dies. Alternately, when his shield
depletes, drop your gun and throw a grenade until he dies. Be careful though -- stay a
good distance away to avoid being hit and killed.

Get two Brute plasma rifles and run away. When his shields are down, throw grenades
then shoot him. He should die quickly.

Play until you reach the part where the Scarab is going to blow open the door. Then, fly
your Banshee down to the water and get out. Walk into the water and you will be invisible
to your opponents. However, you will be able to see them, making this the perfect place to
go under the legendary difficulty setting to kill your enemies without them seeing you.
You may also take a Ghost or a Spectre down here. If you are skilled enough, you can even
take them up very close to the top of the structure.

On defense, go up the slope with the needler next to it. Keep going to the right, then
right, and right up the stairway until you see a rocket launcher. Get it, then go inside
the spinning wheel and wait for their Ghost or Warthog.. This is a very easy way to get
kills, and triple kills from the Warthogs. Be on alert for snipers. Zoom in with your
rocket on the left side if you suspect one.

On offense, go up to the control tower. An easy way to find it is by the plasma gun and
three plasma grenades next to it. There should be a camouflage. Grab it. Next, there will
be a huge machine directly next to you. If you climb up and go in the spinning wheel you
will find a hole. Go in it and wait until it spins you to the energy sword. If you get the
sword first, then go for the camouflage, you will get many kills if you slip into the
defensive base.

When you are on offensive, go up the stairs to your left. There should be a sniper with
some grenades next to it.. This is a great way to kill people on turrets, grabbing the
rocket launcher, and people trying to get the energy sword. If you take out the man with
the rocket launcher, you can jump into a Ghost and be ready for some massive kills.

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.

Keep pressing Jump to jump faster.

If you have picked up a frag grenade and a plasma grenade, press Black to change from one
to another.

When you have a depleted energy sword, turn on your cloak as the Arbiter. Your sword will
still look like it is there while cloaked, even though it is not.