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Unlockable: Mirror Mode
You must complete the game once.
Unlock Hyper Arcade Mode
To unlock Hyper Arcade mode, beat Arcade mode with the shotgun.
Unlock New Guns
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
Extra Options
Arcade Mode - Finish the main game.
Arcade Mode Weapons - Finish arcade mode with the different weapons.
Country Challenges - Finish the countries in the main game.
Mighty Joe Jupiter: Episode 2 - Finish the cadet training easy stages.
Mighty Joe Jupiter: Episode 3 - Finish the cadet training normal stages.
Mighty Joe Jupiter Trilogy - Finish the cadet training hard stages.
Juke Box - Finish the Mighty Joe Jupiter Trilogy.
Unlock Might Joe Jupiter Trilogy
Beat all the Mighty levels in Cadet Training to unlock Mighty Joe Jupiter Trilogy (in MJJ mode).
Unlock Music Juke Box
Finish all episodes of the Mighty Joe Jupiter Trilogy to unlock Music Juke Box, which can be found in the options screen.
Main Cheat - Unlock All Options
On the main menu, press the following:
X thirteen times, SQUARE,
X five times, SQUARE,
X two times, SQUARE,
X nine times, SQUARE,
X seven times, SQUARE,
X three times, SQUARE,
X eight times, SQUARE,
X five times, SQUARE,
X one time, SQUARE,
X twenty times.
Unlock All Bonuses
On the main menu, press:
X thirteen times, SQUARE,
X five times, SQUARE,
X two times, SQUARE,
X nine times, SQUARE,
X seven times, SQUARE,
X three times, SQUARE,
X eight times, SQUARE,
X five times, SQUARE,
X, SQUARE, and then
X twenty times.
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