Items can be used by Billy Hatcher through his adventure to both help him and defeat enemies. Some eggs contain minigames that can be accessed through the game link cable to a GameBoy Advance.
The color wheel challenge is finally done! For pink we have Sakura Shinguji from Sakura Wars, Amy Rose and Pink Flicky from Sonic the Hedgehog, and Rolly from Billy Hatcher. This took a quite a while, but I'm glad I got to draw some Sega deepcuts!