Ok just finish the game. that's how I did it. But there should be a code also. I found out on some website that the code is tak Danny tak jenny. that's what I heard.
Chat with our AI personalities
Collect all of the character portraits.
2 or more
You are going to have to wait the game is still reasonably new. Sorry.
In order to perform a homing attack in Sonic Generations, you are supposed to have gained all 5 red stars before you can unlock a homing attack. However; there is no much use of the homing attack as the destruction caused is minimal.
It's a move tutor attack that you need to unlock somewhere in the battle frontier island