diamond dust zone(sonic blast) since ther is no ice level
casino night zone (sonic 2) since there is no casino level strangely
hydrocity(sonic3) since is fucking awesome!!!!
boss:big arms(sonic 3) ,metal sonic(sonic 3 or 4)or egg emperor
rival: knuckles(sonic3 and knuckles)or mephiles(dont remember the name of the game since i never played it) i know mephiles is suposed tokill sonci in that game end then he gets his ass revived but that was a surprise atack lets give their rivalry another chance