If all seven Chaos Emeralds are collected while playing as Sonic, the leader of the Hard-Boiled Heavies betrays Eggman and takes the gemstone, imbuing himself with immense power.
If all seven Chaos Emeralds are collected while playing as Sonic, an alternate scene takes place. After Eggman's defeat, the leader of the Hard-Boiled Heavies betrays Eggman and takes the gemstone, imbuing himself with immense power.