Sonic Heroes cheats and cheat codes for Gamecube

Unlock New 2 Player Modes
2P Action Race Unlocked from start
2P Team Battle Collect 20 emblems
2P Special Stage Collect 40 emblems
2P Ring Race Collect 60 emblems
2P Bobsled Race Collect 80 emblems
2P Quick Race Collect 100 emblems
2P Expert Race Collect 120 emblems

Unlockables: CG Theatres
Team Chaotix Cinema: Complete Team Chaotix in Story Mode
Team Dark Cinema: Complete Team Dark in Story Mode
Team Rose Cinema: Complete Team Rose in Story Mode
Team Sonic Cinema: Complete Team Sonic in Story Mode

Unlockable: Super Hard Difficulty
Beat the game with 141 Emblems and all A ratings.

Metal Sheen
Hold A and Y after selecting a 2-player level to have a "metallic" skin
covering over your team.

Unlockable: Last Story
Find all 7 Chaos Emeralds and finish all stories