What cheats are there in Sonic the Hedgehog?

Answer 1

Beating Silver (Sonic and Shadow Storyline Only)Sonic:

Quickly get some rings and wait for Silver to say something such as "Take this!" and homing attack him quickly. Once done, wait for Silver to get up and use the tornado move and repeat step 1, or just skid him if you haven't unlocked the tornado, just keep trying.

Shadow:

Jump up to the higher section and grab a ring box, and jump down to confront Silver, if you land right next to him, use your tornado spin attack to secure your spot and damage him. Whenever Silver flings crates at you, use Chaos Spears to break the boxes, and then unleash a homing attack, just keep repeating keeping a safe amount of rings.