Unlock Master Code
At the Main Menu screen enter the Code MEBIGCHEAT by pulling the trigger to correspond
with the order of each letter of the alphabet (13,5,2,9,7,3,8,5,20). After each entry press
Duck to input the next letter.

Unlock Country Challenges
At the Main Menu screen enter the Code ABROAD by pulling the trigger to correspond
with the order of each letter of the alphabet (1,2,18,15,1,4). After each entry press
Duck to input the next letter.

Ending bonuses
Successfully complete the game to unlock the "Arcade Mode" option at the extra menu and the "Mirror Mode" option at the arcade mode menu.
Information in this section was contributed by achiever10.

Machine gun
Successfully complete the game in arcade mode using the pistol. Start a new game in arcade mode to use the machine gun.
Information in this section was contributed by achiever10.

Cane gun
Successfully complete the game in arcade mode using the machine gun. Start a new game in arcade mode to use the cane gun.
Information in this section was contributed by achiever10.

Shotgun
Successfully complete the game in arcade mode using the cane gun. Start a new game in arcade mode to use the shotgun.
Information in this section was contributed by achiever10.

Hyper Arcade mode
Successfully complete the game in arcade mode using the shotgun to unlock the "Hyper Arcade Mode" option at the arcade mode menu.
Information in this section was contributed by achiever10.

Mighty Joe Jupiter Trilogy
Successfully complete all Mighty levels in cadet training mode to unlock the "Mighty Joe Jupiter Trilogy" option in Mighty Joe Jupiter mode. Complete the easy levels in cadet training mode to unlock Mighty Joe Jupiter Episode 2. Complete the normal levels in cadet training mode to unlock Mighty Joe Jupiter Episode 3.
Information in this section was contributed by achiever10.

Music Jukebox mode
Successfully complete all episodes in the Mighty Joe Jupiter Trilogy to unlock the "Music Jukebox" option at the Options screen.