Movie Viewer
Successfully complete Boss Rush mode to unlock the "Movie Viewer" option.
Original Japanese voice acting
Successfully complete the game, then choose to start a new game. Then at the difficulty selection screen, hold L + R and press Left, Up, Right, Down, Left, Up, Right, Down, Left, Up, Right, Down. If you entered the code correctly, you will hear a sound.
Unlock Armor
Give 30 Gold Medals to Hyperbolic in Beginner mode.
Unlock Chinese Dress
Get the good ending in Hard mode.
Unlock Kimono
Set the system date between January 1st and 7th.
Unlock Leopard Suit
Get the good ending in Crazy mode.
Unlock Maid Outfit
Can be bought from the vending machine at Spinach Caverns - Shadow Grotto.
Unlock Monkey Suite
Get the good ending in Beginner mode.
Unlock Nurse Outfit
Complete Boss Rush mode in Happy mode.
Unlock Pajamas
Get the good ending in Normal mode.
Unlock Princess Dress
Give 30 Gold Medals to Hyperbolic in Normal mode.
Unlock Samurai Outfit
Give 30 Gold Medals to Hyperbolic in Crazy mode.
Unlock Santa Outfit
Set the system date between December 25th and 31st.
Unlock School Uniform
Get the good ending in Happy mode.
Unlock Swimsuit
Complete Boss Rush in Crazy mode.
Unlock Vampire Outfit
Give 30 Gold Medals to Hyperbolic in Hard mode.
Unlock Witch Outfit
Give 30 Gold Medals to Hyperbolic in Happy mode.
Unlock Work Uniform
Complete Boss Rush mode in Hard mode.
Unlock Workout Gear
Complete Boss Rush mode in Beginner or Normal mode.