- Eye mini-game
Overcome the Eye in Story mode to unlock the Eye mini-game in Multiplayer mode.

- Bonus gloves
Have the Game Boy Advance game Sonic Advance or Sonic Advance 2 in the cartridge slot to unlock the pink gloves in Maniac mode. Alternately, get 55,555 Heart Points.


Have the Game Boy Advance game Sonic Battle in the cartridge slot to unlock Amy Rose's gloves in Maniac mode. Alternately, get 77,777 Heart Points.


Have the Game Boy Advance game Chu Chu Rocket in the cartridge slot to unlock the fist gloves in Maniac mode. Alternately, get 88,888 Heart Points.

- Holiday greetings
Set the system date to December 25, January 1, and other holidays to hear a new greeting from the girl.

- Studio option in Maniac mode
Find 30 Rabbits to unlock the 'Studio' option in Maniac mode.

- Swimming On A Tree mini-game
Successfully complete the Swimming On A Tree mini-game in Story mode to save the girl from the crocodiles and unlock the Swimming On A Tree mini-game in Multiplayer mode.

- Table Hockey mini-game
Overcome Disk in Story mode to unlock the Table Hockey mini-game in Two Player mode.

- Snowball Chase mini-game
Successfully complete Scene 23 in Story mode, where you chase the girl, to unlock the Snowball Chase mini-game in Multiplayer mode.

- Hair Color option in Maniac mode
Find 10 Rabbits to unlock the 'Hair Color' option in Maniac mode.

- Skip Story mode level
Tap the blue button at the lower right corner of the 'Begin/Quick Begin' menu that appears before a level. Tap the yellow button that appears. Tap the small button that appears and select 'Yes' three times. Notice: This can only be done once on each difficulty setting in Story mode.

- Birthday greeting
On the date that you entered as your birthday in the system settings, the girl will greet you by saying 'Happy Birthday' at the main menu.

- Cake Battle mini-game
Successfully complete the Snowball Fight mini-game in Story mode against the girl to unlock the Cake Battle mini-game in Two Player mode.

- Bull mini-game
Successfully complete Scene 8 to unlock the Bull mini-game in Survival and Time Attack modes.

- Another Story mode
Successfully complete Story mode to unlock the 'Another Story' option.

- Seashells mini-game
Successfully complete Scene 16 to unlock the Seashells mini-game in Survival and Time Attack modes.

- Sound recorder
At the title screen, press Down + Y to record from the microphone. Push Down + Y at the title screen again to play back the recording.

- Sound Test
Successfully complete Story mode to unlock the 'Sound Test' option.