Endgame Cheats

Go to the main menu and spell out LETSBOOGIE by
pressing these buttons Fire(12times), Reload, Fire(5times),
Reload, Fire(20times), Reload, Fire(19times),
Reload, Fire(15times), Reload, Fire(15times),
Reload, Fire(7times), Reload, Fire(9times),
Reload

Successfully complete the game in arcade mode using the shotgun to unlock the "Hyper Arcade Mode" option at the arcade mode menu.
Game Shark Codes
Master Code (Must Be On) 0E3C7DF2 1853E59EEE983936 BCCEDD42
Unlock Arcade Mode CE949BF2 BCA99B84
Unlock Hyper Arc Mode in Arcade Mode DE949A3E BCA99B84
Unlock Arc Mode Machinegun in Arcade Mode DE949AFA BCA99B84
Unlock Arc Mode Cane Gun in Arcade Mode DE949A86 BCA99B84
Unlock Arc Mode Shotgun in Arcade Mode DE949A82 BCA99B84
Unlock Mirror Mode in Arcade Mode DE949A8E BCA99B84
Unlock Jukebox DE949A9E BCA99B84
Infinite Health on Cadet Training 0EC9387E BCA99B83CEC9387E BCA99B86
Unlock Alien Skeet Training Level CE949772 BCA99B86
Infinite Ammo on Alien Skeet Training Level C192871E BCA99B89
Unlock Duck 'N' Cover Training Level CE94977E BCA99B86
Infinite Ammo on Duck 'N' Cover Training Level CE80828E BCA99B89
Unlock Chicken Run Training Level CE94977A BCA99B86
Infinite Ammo on Chicken Run Training Level CE82783E BCA99B89
Unlock Pot Shot Training Level CE949706 BCA99B86
Infinite Ammo on Pot Shot Training Level C197ECCE BCA99B89
Unlock Rapid Fire Training Level CE949702 BCA99B86
Infinite Ammo on Rapid Fire Training Level C19D3C7E BCA99B89
Unlock Chain Reaction Training Level CE94970E BCA99B86
Infinite Ammo on Chain Reaction Training Level C19CB33E BCA99B89
Unlock High Noon Training Level CE94970A BCA99B86
Infinite Ammo on High Noon Training Level C19A342E BCA99B89
Unlock Save Andromeda Training Level CE949716 BCA99B86
Infinite Ammo on Save Andromeda Training Level C19E6D6E BCA99B89
Unlock Six Shooter Training Level CE949712 BCA99B86
Infinite Ammo on Six Shooter Training Level C191345E BCA99B89
Unlock Who's The Boss Training Level CE94971E BCA99B86
Infinite Ammo on Who's The Boss Training Level C19F997E BCA99B89
Unlock Great Britain Race CE949BE6 BCA99B84
Unlock France Race CE949BE2 BCA99B84
Unlock Germany Race CE949BEE BCA99B84
Unlock Italy Race CE949BEA BCA99B84
Unlock Switzerland Race CE949BF6 BCA99B84
Unlock Mighty Joe Episode 2 CE949A8A BCA99B84
Unlock Mighty Joe Episode 3 CE949A96 BCA99B84
Unlock Mighty Joe Trilogy CE949A92 BCA99B84

To unlock new guns, beat the game in Arcade Mode to unlock the new weapon. Here's how:
Beat with pistol: machine gun
Beat with machine gun: cane gun
Beat with cane gun: shotgun

Successfully complete the game in arcade mode using the cane gun. Start a new game in arcade mode to use the shotgun.

Finish all levels in the Mighty Joe Trilogy