This Code works most of the time. First select "players" on the main menu. Then go to "cheats." Next you MUST write this code in correctly with spaces or it won't work. The code is: "up up down down left right left right b a select start". If not entered correctly the code will not work.
Chain gun
To get the Chain gun early, go to the training level and follow the instructions until you get to the ladder. Look to your left. You should see a wall. If you shoot the wall it will break. Keep shooting until it will not break anymore. The Chain gun will be there. If you have already unlocked the Chain gun, you will just find an ammo drop.
Cheat Codes
Go to "Players", and then "Cheats". Enter one of the following codes.
Effect
Code
Cute message
iopred
Programmer message
DayDream
Unlocks A-Bomb Launcher
Missile launch detected
Unlocks Airstrike
Call in artillery
Unlocks All Levels
You are the moon master
Unlocks Amazon Jungle
Ive got jungle fever
Unlocks Anytime
I dont have time to bleed
Unlocks Auto laser rifle
Beta
Unlocks Black Hole Generator
Wash away the rain
Unlocks Bladerang
Australians all let us rejoice
Unlocks Bow and arrow
John Rambo
Unlocks Canyon Lands
Aint no mountain high enough
Unlocks Chain gun
Old Faithful
Unlocks Double shotgun
This is my boomstick
Unlocks Drunken launcher
Moonshine
Unlocks Flak Cannon
Shrapnel
Unlocks GooGun
Gloop
Unlocks Guided launcher
Follow the leader
Unlocks LaserRifle
Alpha
Unlocks LaserShotgun
Gamma
Unlocks Sniper rifle
Its a Jackal
Unlocks Soundwaave
Bass in your face
Unlocks SparkPlug
9 Volt
Unlocks Underground Lab
Who rides the wrecking ball
Create a orange cloud using the flamethrower
Go to the training room. Select the flamethrower weapon. Shift through the different times (timebreak, etc.) and at the same time fire the weapon, You should see a cloud shape forming. This is useful when taking down copters.
Extra weapons
In levels 2-1, 2-2, and 2-3, you can get a machine gun and/or machine gun ammo clip from every heli you destroy. Get the heli down to enough health, so that it will only require one grenade to kill it. Use Hyper Jump (hold [Modify] and press [Jump]) to get very close to the heli. You must be close enough to touch it. Use a grenade to finish it off. The heli will drop a machine gun clip with only 25 ammo in it. Note: This will not effect any of the weapons that the helis usually drop; every other time you use this trick you will get two items.
FlakCannon
In order to unlock the FlakCannon you must go to the training area. Then go to where you can shoot the targets. Go into top of that "tower" and use Time Distort (everything slows down). Do a Hyper Jump to the platform where that gun is located.
Googun
In level 2-2, walk right on the screen after the first metal bridge. You will go up an incline. Once at the top, there is a stump. Jump it and there will be another. Hold [Modify] and crouch to fall, then shoot to the right to unlock the Googun.
Level 2-2: Hiding location
In one of the grass levels (level 2-2), you can go under the hangout if you press [Space]. You can then hide from the enemy. If you jump up onto the bridge above, you cannot go straight down. You must walk over.
Nuke
In training mode, hold [Space] and switch to Timebreak mode. Hold [Shift] and start out with the pistol. While holding [Shift], shoot a horseshoe shape around your body, sort of like a forcefield, with all the bullets. Continue holding [Shift] and switch to every weapon and do this until you get to the railgun. Release [Shift] and enjoy.
All Weapons...