Questions:
What does Metro do?
How can i play as knuckles?
Why is this a really good game?
Metro is the ingame DJ, if you click on his laptop there will be a speaker. When you click on that you can select one of the songs (Not Like Us, Euphoria, 6:16 in LA, meet the grahams and BBL Drizzy), above the speaker there is a humanoid if you click on it there will be a menu where you can select Knuckles.
Its just a really good game