Enter The Matrix

Find an area with no enemies. Remain idle and your heath and Focus will rise.

Press Focus while you are close to a wall. If done correctly, this should make your character run against the wall, then eventually do a cartwheel off it.

When on the first level with Niobe, walk into the men's restroom in the main lobby . You should go to a level called Behind The Scenes and skip you two or three levels.

Start a new game under who you want to play Spark's Training Construct as Niobe or Ghost. Wait for all the FMV sequences to finish and save your game when prompted by selecting "Yes". Exit back to the main title screen, with the "Load Game", "New Game", "Options", and "Hacking" options. Select "Hacking". Load the saved game that was just saved. When asked to press a key, do so to clean the system. Your should now be at the "A:\" prompt. Type "CHEAT" followed by a space, then "13D2C77F" Your screen should have "A:\CHEAT 13D2C77F" displayed. Press "Enter". A message stating that you have unlocked a bonus level will appear. This actually refers to Spark's Training Construct. Exit hacking by going to "Exit" in the command list and choosing "Y" (for yes) and pressing "Enter". Save your progress by answering "Yes". Go to "Load game" at the main menu. Look for "Spark's Training Construct" and go there. You can also indicated that it should be the game you just saved; load this. The game will bring up levels you completed. Move to the right until "Spark's Training Construct" appears in view and load it. If prompted, insert the next game disc. You should now be in the hallway full of doors after it loads. Move forward and go to the second red door you see on your right. > Open it and you will now be in a gym where training takes place. Go forward until you see buttons on the wall. Press the left button first. Training will begin. Grab all the weapons behind you and blast your enemies.

Once inside the "shooting range," you can participate in a test of skills. Press the red button and get ready. You will start out behind one of the tables and are told that you are caged in and have to fight. SWAT Agents will start running from the back of the room in your area. If they get up to the 10 ft. mark, youwill lose. Turn around, grab all the guns you can, and take them out. If you get more than twenty, it unlocks the other red door in the hallway. This is where you can engage in hand to hand combat with a never-ending supply of SWAT. This a very good opportunity to harness your fighting skills and find new moves.
Jeff Wilkinson.

In the shooting range in Sparks' Training Construct, look at the hanging targets in first person view. Shoot them until your green crosshairs turn red. Do this to all the targets to open up the other training mode in the same room. You will now be able to push the button on the right. In this mode, you try to shoot the floor out from under people walking across platforms. You will fail if they make it to the other side.
Zach Pitts.

You can only open the red doors. In the beginning only one will be open. Press the red button on the far wall and you will appear before a table. Collect the guns behind you and stop the SWAT members before they reach the 10 foot mark. Note: Use the sniper rifle, and if they get too close, try the shotgun. Shoot the floor of the runners, and when the walkers approach the door quickly shoot them or their floors. Then, work your way across the top row. Score above twenty and the next door and the green button will be available. The green button will set you between you between the tables, and unable to move. With your sniper rifle, shoot the floor beneath them. They will earn you a point, but do not let them reach the doors. After twenty points you can unlock the elevator doors near next to the warehouse in the next red door. In here you will find a red and green button. Push the red button to try and kill twenty people. Note: Use the unlimited focus here. The green button will now be accessible. Knock as many people as you can off the platform within three minutes. Note: Kick them off for as long as you can, and when you engage combat mode throw them off the edge.
The Man.

In the training mode where you have to fire at SWAT team members as they advance, the easiest way to do this is to select a high powered automatic weapon. As soon as you can, backup until your back is against the shelf behind you. Strafe back and forth as you fire, and you will continue to pick up ammunition for your current gun. This will save costly weapon switching time and you will be done quickly.
MajikFire.

You will have to pass a challenge that involves throwing off at least twenty people. Turn around and jump off the left corner toward the entrance. Remain there and they will kill themselves.
billy sage.

Pull out your pistol(s) by pressing Y. Then, press A to hit your enemy with the butt of the gun. Your gun will disappear. While he is dizzy, pull out your pistol(s) again and you will automatically grab his head and shoot him in the stomach.

Press Punch + Weapon Draw (A + Y) as Ghost to grab an enemy and shoot them in the stomach; or pick them up and throw and shoot them in the air.
Kevin F. Lewallen.

When playing as either Ghost or Niobe, hold Focus and go up to someone that has a good sized gun (machine gun or sniper rifle). Press Action (Z). This will make them take the weapon from the enemy and do different things (throw them to the ground and shoot them or smack them with their own weapon).
Kevin F. Lewallen.

There are three easy ways to instantly kill someone (excluding Bosses, Agents, and Vampires). Disarm someone with a long barreled gun (shotgun, MP5, sniper rifle, etc.). If you grab their gun, and smack them with the butt of it. Try disarming someone from behind, thereby putting them in a sleeper hold. The best way, though, is to have a gun out, and throw (Punch + Kick) someone. You will knock them down, then shoot their head.
Teyhota.

If you have two pistols, hold Focus and jump when you are in a combat with someone. You will dive forward and start shooting.
Bob McFadden.

Sneak up on someone, and the "Use" icon will appear. When this happens, press Use. Your character should start strangling the enemy. Immediately press Focus to swing them to one side. You will then hear the sound of their neck breaking.
lorenc88.

When sneaking up on someone and choking them from behind, tap Focus and your character will break your opponent's neck.
Craig Spitzer.

To get an instant kill, you must have a gun out. When an enemy is coming at you, press Y + B to perform a knock back shooting move.
Steven Pearson.

When you are at the Tea House, lose the fight and you will go to the end. You will not have to put up with the Agents and will miss about four stages.

When playing as Niobe and are being chased by the Agent, get to one of the pillars with the gas tanks. Wait for the Agent, then shoot it as he runs by. If timed correctly, it will explode and he will die. You will even be able to see his body. You will, however, see him at the ladder at the end of the level.

When you are running from the Agent, run past the flammable gas tank. Wait for the agent, then shoot the tank. This will kill the Agent. When you get to the ladder at the end of the level (if you are fast enough), you will see a police officer turning into an Agent. While he is shaking, shoot him in the head. This will kill him again for a very long time.
Zack M.

When you start the level, kill all the guards. Then, look at the picture on the easel. It shows you the layout of that section of the post office. The red X is you, the green arrow is the fork lift, the green Xs are enemies, and the red O with a line through it is the place with the smoke grenade.

When you first start the level, kill the first two SWAT men. Then, travel about halfway down and you should see a whiteboard. Go up to it and look at it in first person view. It shows the plan for the level, where they will attack from and how many SWAT men are in each section.
PowerHalf.

When playing as Ghost on a level where Niobe is driving the car, hold A the entire time because you have unlimited ammunition.

While in hand-to-hand combat at close range, press Weapon Draw. You will kick your opponent backwards, draw your gun, and fire at him while he is still in the air. This is effective, fun, and looks good. Do this while Focused for added effect.