Take no damage from the final boss and clear the stage in Shadow Generations.

Clear all the Challenge Acts in Shadow Generations.

Collect all the Chaos Emeralds.

Defeat Silver.

Restore the ROOFTOP RUN Stage Gate.

Defeat Perfect Chaos.

Restore the SEASIDE HILL Stage Gate.

Restore the SPEED HIGHWAY Stage Gate.

Defeat Metal Sonic.

Restore the CHEMICAL PLANT Stage Gate.

Clear Shadow Generations.

Defeat Mephiles.

Defeat Metal Overlord.