you have to get all of chaos emeralds and beat all stories.
P.S It is a boss that you face not a level
you can't skip a level on sonic heroes. trust me i finished the whole game.
Only you can hack it:(
Yes, For The Last Secret Boss.
To unlock the Last story on Sonic Heroes, you have to play all other stories:team sonic, dark, rose and chaotix all the way through (100%)
I just kept lvling up in the area and eventually was able to hit Eggman hard enough to knock him down easy.
They are Trophies you get that tell you that you finished a level + did it well
What I'm made of from the last stage of Sonic Heroes
Sorry,no.
there are 2 keys per level excluding boss levels
There is no Sonic Heroes 2
"Sonic Heroes"
Sonic Heroes happened in 2003.