Here are the tracks for a sonic racing game I'd make.
Here are the descriptions of the levels:
(Green Hill) the first level and a tutorial.
(City) the city with many twist and turns for each character type, zombots dot the land of this race. (Wait wasn't the metal virus chaos controlled a long time ago?)
(chemical plant) an iconic zone that first introduces water to this race.
(Angel Island zone) This race will have lot's of jungle related gimmicks.
(Labyrinth zone) Which way is out? You can't tell here, make sure to get plenty of air though.
(Palm Tree Panic) Wait little planet isn't in orbit yet we're here.
(Prison Island) wait this place blew up years ago how is it still here?
(Death Egg Zone) Didn't this zone blow up a long time ago during the war? Somethings not right.
Those were the descriptions. send me more track ideas and I'll do my best to answer.