Engame

New Weapons:
Finish the game using arcade mode with the weapon indicated to get the new weapon when starting a new arcade game
pistol --> machine gun

machine gun --> Cane gun

cane gun --> Shotgun

Get Arcade & Mirror Modes:
Finish the game 1 time to get arcade mode and Mirror mode

Get Hyper Arcade Mode:
Finish the game 1 time in arcade mode using shotgun to get Hyper Arcade mode

Get Mighty Joe Jupiter Trilogy:
Use cadet training mode and finish all Mighty levels. Complete those to get normal mode levels (Joe Jupiter Episode 2) and finish those to get Joe Jupiter Episode 3

Get Music Jukebox:
Finish all levels in the Mighty Joe Trilogy