The Rub Rabbits!

Unlock gloves:

How to Unlock - Unlockable
Get 55555 Hearts or put Sonic Advance 1or2 in the GBA-Slot: Pink glittery Gloves
Get 77777 hearts or Sonic Battle into your GBA-Slot: Amy Rose's boxing Gloves
Get 88888 hearts or Chu Chu Rocket into yoour GBA-Slot: Fist Gloves

Unlock new Survival mini-games-Time Attack:
Bull mini-game: Finsih Scene 8
Cake Battle mini-game: Finish the Snowball Fight mini-game
Eye mini-game: Beat the Eye in Story mode
Seashells mini-game: Finish Scene 16
Snowball Chase mini-game: Finsih Scene 23
Swimming On A Tree mini-game: SFinish the Swimming On A Tree mini-game
Table Hockey mini-game: Beat Disk in Story mode
Graffiti time attack: Available from the start

Unlock Multiplayer Battle Games:

How to Unlock - Unlockable
Available from the start: Ball
Win Snowball fight in Story: Cake Battle
Win eye in Story: Eye
Win Snowball Chase in Story: Snowball Chase
Win the game in Story, save your girlfriend from the crocodiles: Swimming on a tree
Win Disk in Story: Table Hockey

Unlock Hair Color: Find 10 Rabbits
Unlock Studio options in Maniac mode: Find 30 Rabbits

Unlock Sound Test + another Story mode:
Finish Story mode