Endgame

Cheat mode
Press the fire button the indicated times, to enter the indicated
letters from ABC. Press Reload to move on to the next letter.
Example:
Fire(1 times) meanings "A" letter
Fire(26 times) meanings "Z" letter

Master code
Enter "MEBIGCHEAT" as a code. After go to the main menu and press:
Press Fire(13 times), Reload, Fire(5 times), Reload, Fire(2 times),
Reload, Fire(9 times), Reload, Fire(7 times), Reload, Fire(3 times),
Reload, Fire(8 times), Reload, Fire(5 times), Reload, Fire, Reload,
Fire(20 times), Reload.
If the code is accepted, you will see the screen flash.

Unlock Arcade mode option in the Extras menu:
Enter "BLAM" as a code. After go to the main menu and press:
Fire(2 times), Reload, Fire(12 times), Reload, Fire, Reload,
Fire(13 times), Reload.
If the code is accepted, you will see the screen flash.

Country challenges
Enter "ABROAD" as a code. After go to the main menu and press:
Fire, Reload, Fire(2 times), Reload, Fire(18 times), Reload,
Fire(15 times), Reload, Fire, Reload, Fire(4 times), Reload.
If the code is accepted, you will see the screen flash.

Unlokc Mighty Joe Jupiter mini-games
Enter "MIGHTIER" as a code. After go to the main menu and press:
Fire(13 times), Reload, Fire(9 times), Reload, Fire(7 times), Reload,
Fire(8 times), Reload, Fire(20 times), Reload, Fire(9 times), Reload,
Fire(5 times), Reload, Fire(18 times), Reload.
If the code is accepted, you will see the screen flash.

Unlock Mighty Joe Jupiter Trilogy option:
Finish all Mighty levels in cadet training mode

Unlock Mighty Joe Jupiter Episode 2:
Finish the easy levels in cadet training mode

Unlock Mighty Joe Jupiter Episode 3:
Finish the normal levels in cadet training mode


Jukebox and music test cheat:
Enter "LETSBOOGIE" as a code. After go to the main menu and press:
Fire(12 times), Reload, Fire(5 times), Reload, Fire(20 times), Reload,
Fire(19 times), Reload, Fire(15 times), Reload, Fire(15 times), Reload,
Fire(7 times), Reload, Fire(9 times), Reload.
If the code is accepted, you will see the screen flash.

Unlock jukebox and music test:
Finish all episodes in the Mighty Joe Jupiter Trilogy

Unlock "Arcade Mode" option in the extra menu:
Finish the game once.

Unlock "Mirror Mode" option in arcade mode menu:
Finish the game once.

Machine gun in arcade mode
Finish the game in arcade mode using the pistol after begin a new game.

Cane gun in arcade mode
Finish the game in arcade mode using the machine gun after begin a new game.

Shotgun in arcade mode
Finish the game in arcade mode using the cane gun after begin a new game.

Hyper Arcade mode
Finish the game in arcade mode using the shotgun.,