you must kill the first two robots fly a lot and that's tails section
beat the death egg as super sonic and hyper tails
you have to beat the story of sonic, tails or knuckles.
You have to beat him in a boss fight with Sonic.
Keep jumping on him and dodge his atacks
beat all stories
you have to beat the train staion level either sonic or silver.
dont know you should of unlocked him dont ask me try to get an s rank on all of them might work
Depends on who your playing with.
there are alot of bosses with dr robotnik, and there are a few games called sonic the hedgehog, please specify.
Simply beat Sonic in each level you go to and then you have to beat eggman at the end then after that destroy his eggwalker.
There is a small possibility.Most likely no.Unless Tails cheats but that would be hard. sonic could beat tails esliy because in the sonic mega collection sonic was running after dr eggman when dr eggman was in his ship and tails was 10miles behind sonic tails was so tiard he had a nap just like that bunny did when the bunny was haveing a race with the turrtle and the turrtle won the race
P. u have to go through the levels, beat bosses.