At any level before the stage where you have to kill General Tatarin, go to the rebel base. Go in circles around it to find a machine gun that has 3600 rounds.
Bonus Level
Successfully complete the game under the Rebel or higher difficulty setting to unlock the Liberty Island level.
Cycle through spawn points
Press Y, A, X, B, A, Up during game play. A message will appear at the top of the screen to confirm correct code entry. Repeat the code to disable its effect.
Defeating General Tatarin
To easily kill General Tatarin on your first trip to Governors Island, sneak down to where you have to go right over all the barriers. Take out those troops and look for a wall that is shorter than the buildings beside it. Try to look over the barrier to see a basement entrance. Then, look for a window that has a light behind it. Enable the "Rocket launcher, miscellaneous items" code. Fire at the window and the "Killed Tatarin" message should appear. Then, run away quickly. Alternately, walk down the same way, but get on top of the crates. There will be a guardrail where the first
fence segment ends. If you are lucky, you can jump to it, climb the rail, and find the door. You will fight various opponents and finally the General. If you enable the "Blind Enemies" code, it will be a lot easier, and you can kill General Tatarin with any weapon.
Enemy Cannot See You
During the game enter the following sequence - Y, A, X, B, B, LEFT.
Fast Mode
During the game enter the following sequence - Y A X B B DOWN.
Fly Mode
During the game enter the following sequence - Y A X B X UP.
Full Charisma
During the game enter the following sequence - Y A X B A DOWN.
Hair length
While playing the game, notice that Chris' hair gets longer with every mission.
Heavy Gun
During the game enter the following sequence - Y A X B Y DOWN.
Invincibility (PAL version)
Press Y, A, X, B, X, Right during game play. A message will appear at the top of the screen to confirm correct code entry. Repeat the code to disable its effect.
Liberty Island mission: Programmer message
At the end of the level, enter the head of the Statue of Liberty to see a programmer message in lights.
Liberty Island mission: Returning to boat
Once you kill General Tatarin, do not bother taking land back to your boat. Just jump into the water and swim there.
Multiple Weapons
Okay, you can't carry more than one weapon at once, but if you have two weapons you can't decide for, and you have the time, you can bring both along. Holding one weapon, stand over the one you want to bring along. The 'Press A to switch Weapons' message should appear. Now, rapidly tap A while -walking- not running forward. If you move to fast, you will drop on. If you walk, you can drop the weapons and immediately pick them up again. I once had a full Shotgun and a full Assault Rifle carted to a fall back point, so when I ran out of my current weapon, I would be able to go back.
Nailgun
During the game enter the following sequence - Y A X B A LEFT.
Resurrect
During the game enter the following sequence - UP DOWN BLACK WHITE.
Rifle
During the game enter the following sequence - Y A X B Y UP.
Rocket Launcher
During the game enter the following sequence - Y A X B Y LEFT.
Shotgun
During the game enter the following sequence - Y A X B B UP.
Slow Mode
During the game enter the following sequence - Y A X B B RIGHT.
Sniper Rifle
During the game enter the following sequence - Y A X B Y RIGHT.
Sub Machine Gun
While playing, enter the code: Y, A, X, B, Y, Up.
Thin Ice mission: Kill your own soldiers
Your first objective is to destroy the ventilation shaft so that your troops can roll up inside. After you complete the objective, send one of your troops to the middle of the destroyed fans. Then, throw a grenade at them. Some will just duck and when the grenade explodes; they will fall down and die. To kill your own soldiers on this level, simply order one of them to go to the edge of the ice. Then either throw a grenade by him, or go over to him and punch him.
Eventually he will fall in the water and freeze to death. The best way may be to get a rocket launcher (enable the code if needed) as well as the "Flymo Ragdoll" code. Shoot the rocket near the man. He will fly in the air then fall into the water. It will take him a long time to get up, but when he does he automatically dies.
Go to the edge of the level and tell your people to defend. Step back and enable the "Rocket launcher" code. Shoot them and they will fall into the water and die.
Unlimited Ammo
During the game enter the following sequence - Y A X B A RIGHT.
