Alright. I am not 100% sure about this. but I think I'm right in saying that this isn't the nicks arcade version of Sonic 2. The only reason I believe this is because of Emerald hill's level layout. If you look inside the timeline part, there is a level-layout of the "older" Emerald Hill, the bottom path (which in the final is a spring leading downards on Act 1) was a set of spikes, column, spikes, column, spikes, lower column, path. Please correct me if I am wrong however?