To open the Star Locker, break Hank Redwood's records in Leila mode, then complete the game once. The Star Locker contains all weapons with unlimited ammunition. Note: You may not be able to complete the game normally if the Star Locker is used.

Adam vs. Angela - Adam's attack are very powerful -- stay away from him. First, turn the gas pipes on by looking for a console that has a diagram of them. Look around the room to find a smaller A & B console. Look carefully and you will see the gas pipes. Shoot Adam five times rapidly and he will stop. Then, shoot the pipe. After you hit him, run as fast as possible because he will run after you very quickly. You will get damage no matter what, but you will have to repeat the whole thing again to kill him.

Adam vs. Jack - This battle is different than when Angela fought Adam. He will now stand in the center of the room and shoot lasers at you. The red ones are easy -- hide behind a wall. For the blue ones, you have to guess where it is going and get out of there.

Defeating Gladiator - You can only use the handgun you cannot use Health Packs or Adrenaline. There are five circular plates on the floor. Stand on one and a lighting bolt will hit it. It can cause damage to you. However, if timed correctly, you can lure Gladiator towards you and jump out of the way, allowing the bolt to hit him instead.

Door password - To unlock the room on the second floor of the bikers' hideout, enter "1993" as a password.

Ramirez's spiders and door - When you battle Ramirez's spiders, shoot them once then stand over them. Press Action, then guide the spiders towards the door. Press Action again to make the spiders jump at the door. Eventually they will melt the mechanism with their acid blood and you can enter.

Defeating Ramirez - To defeat Ramirez the second time, you must get up and shoot out the lights. He will then only throw grenades. Next, get up close and shoot him to kill him.

Shoot out the lights first, but since Ramirez has a powerful gun, run behind one of the containers. If you have a good view, you will see him point his gun away from you. This is your chance to attack. Give him everything you have for a moment, then duck back.

Equipment and ranks:

Automatic: C
Scorpion NerveoStunner: C
Stimulator Automatic +: B
Simulator Shotgun Rank: B
Action Belt: B
Sub Machine Gun: A
CodeBreaker: A
Missile Launcher: AAA
Goggles: AAA

Walk through walls - Find a location with an elevator with a gate-like door. Hold L to crouch, then press A to open the elevator door. You can now walk through any wall on the current level.