Enter The Matrix

At the beginning of the level as you go into the first terminal, go forward and two civilians will run out of a door and a policeman runs out of a gate. If you let the policeman get away, he will shut himself behind a gate. Kill him before he does this and a box of five flash bangs will appear. Walk over it to collect them.

Pull out a sniper rifle quickly after the level loads. Then, put yourself in first person mode. A circle with a cross through it will appear. Next, press Focus and wait for the plane to come into your sights. Wait for the front wheel to come into the circle in the middle and shoot. You will need to do this multiple times to shoot the wheel. When you finally get it, you will see the bullet hitting the tire and popping it. You will then have to shoot the helicopter and get out of the tower.

Take out any gun, go into Focus mode, then run and jump while shooting. When in Focus, your aim improves and the run and jump will help you dodge bullets.

It is possible to take down Agent Smith without a wall kick, even if temporarily. First, scoot back so he does not throw you, then equip any gun and fire. At the same time, go into Focus and while he is dodging the bullets you just fired, run in then punch or kick him until he goes down. Kicks are recommended because they are more powerful. Then, get out of there while still using Focus. When you are out of harms way, let off the Focus. Note: Doing this in cramped spaces such as hallways is not recommended unless absolutely necessary.

When fighting the Agent Smiths, there will be a level where you find a grenade launcher. Stay far back when shooting or you will be caught in the explosion. The Smiths will die with about three shots from the grenade launcher. Be careful -- even when you have unlimited health, you could be blown off the buildings and die. Also, do not get close to the Smiths or they will throw you. When a Smith dies, you will be able to pick up an actual Agent's gun (the .50AE), which can be used in dual handguns. These handguns are the most powerful in the game.
EdYi.

Get a 40 mm grenade launcher. Go into Focus mode and shoot him three or four times. Look again and he will be dead on the floor. You can take his gun if desired. Kill another one to have a double weapons.
franela_man.

In one of the Chinatown levels where you escape from Agent Smith, there should be a grenade launcher somewhere. Three shots with this will kill Agent Smith.
Aleksander Karlsen.

In certain levels you have grenades or grenade launchers. Three launched at far range or one at close range will kill them. If they do not die, pull out a gun. When the auto aim is red, it indicates near death; you can easily take them in hand to hand combat. Sometimes sparking objects are nearby. Knock them into it and will die.

On the level where the Agents chase you up the stairs and onto the rooftops, you can kill them. Before entering the levels, make sure you have enabled the "Unlimited ammunition", "Unlimited health", and "All weapons" codes.. At the beginning of the level, cycle through your weapons and select the grenade launcher. As soon as an Agent runs after you, shoot him three times with the grenade launcher. Wait until the smoke clears and they will be dead.
Steven.

This trick works best if you are Ghost. In any level that has an Agent and you are or can get to a roof, go up to the Agent. He may kick or punch you back; watch the ledges. Hit him once or twice so that the camera pans to the side. Walk up to him, punch him, then do a Focus Kick (without pressing a direction). The agent will fly back. While he is on the ground press Punch(2), Focus + Back + Punch. This will do an uppercut, sending him flying. Once he is in the air, press Kick and Ghost will do a flying kick, sending the Agent soaring across the room. If you are on a roof, do this to send him flying over the edge, where he dies on impact.
Nemesi24.

Enable the "Unlimited ammunition" code and obtain the GP gun (which takes the oxygen out the air). It can kill an Agent.
sheldon smith.

The first time you face an Agent, run. Towards the end of the pursuit, the Agent drops directly in front of you. Note that there is is a gap in the building between you and him. Focus and make the jump. Then, while he still getting up from the fall, run behind him with your back close to the wall and do a kick off the wall. He will fly into the gap, and get killed.
TurdFergusen423.

When fighting Agents, kick continuously at them while they are near a wall. They will soon be laying in the wall.
UYH770.

In levels with multiple Agents, use Invisibility and hit one. It may make him fight his partner.
hflampman.

In the level with the Gp-25 Launcher, go up to an Agent and shoot him. He will try to dodge it, but the smoke kills him. Note: You must be Niobe to see an Agent in this level.
Craig Krienke.

It is possible to kill Agents in either of two ways, using a grenade launcher/thrown grenades, or by hand to hand combat. However, to kill them in hand to hand combat, you need to be on a level with rooftops or windows. This strategy works best with Ghost, since his punch combo involves sending an Agent in air, and you can follow up with a jump kick. In order to get close enough to the Agent to send him in his downward plummet, you need to have the "Unlimited Focus" and "Unlimited Health" codes enabled. The "Swordfight" code also works well for taking on multiple Agents, but is not necessary. First, shoot at the Agent so that he starts dodging the bullets. Then, use your Focus, get into him, and use the back punch combo that uses the two uppercuts. Next, kick at him and repeat until the Agent has fallen to his demise. Throwing works as well, if do are not using the sword
Matt Daniels.

An easy way to kill Agents is to blow them apart with explosive weapons. Enabling the "Unlimited health" code is recommended. Three to four grenades may be needed.
a hacker.

To kill any Agent you encounter, enable the "Maximum fire power" code. Take out your grenade launcher and blow him up about four times. Note: the explosions will kill you if you do not have unlimited health active.
flamehead85.

In the last level at the Nuclear Power Plant, you must escape from several Agents. In the Transformer Field-level, you should have obtained a Chloride-gun (gas-grenade launcher weapon). When you use it against Agents, they will choke and die.
Aleksander Karlsen.

Let him strike first, and stay defensive. After this, lay it on him then back off and repeat.

When you are in a close area, Focus and do a wall run. Then, press Jump and move your character to the other wall. Next, do another wall run then press Jump. You should still be in Matrix mode. If done correctly, you will be able to dodge a lot of bullets.

Successfully complete the game under any difficulty setting. The ending sequence includes what appears to be a trailer for The Matrix Revolution, the sequel to The Matrix Reloaded.

To hear "Going Under" by Evanescence, complete the game. The entire song will be played at the end credits.
Dave Elliott.

Every highway sign you see in the highway level is a cheat for the game.

Look on the billboards in the game on the freeway.
Rickster1146.

You may have trouble grabbing the flashlightm which is actually a MP5 icon. To get it, take out your MP5 and waste its ammunition so that the gun is no longer in the inventory. The same goes for MP5 pistols. Once this is done, you can pick up the flashlight/MP5. Equip it to turn on the flashlight.