This is a cheat so you can fight Dr eggman and eggman negga!

Well,first you need blaze to collect all the sol emralds(I preferred easy diffilcuty setting for the seventh one) and let sonic collect all the chaos emralds.Defeat zone F.If you do all this,you should get a red symbol on gameplay that says "Extra".There should be a picture of sonic,blaze,Dr eggman and eggman negga.When you press A or press (with your styles) Extra,Instead of saying "Sonic the hegdehog" or "Blaze the cat", it should say "Sonic and Blaze"In unision.It is very hard to beat the eggmen,but it is worth it when you find out the secret!