The Time Travel Theory

Wood Zone and Metropolis zone is the most obvious one going and the future for that I think would be Genocide City, for some weird reason.

 

NO! You've got it all wrong! WZ is a part of ARZ, which is the past of EMH, which is the past of HTZ, which is the past of Windy Valley!!! *attacked* And yes, I know there can only be 3, but here's a story:

Let's say there's an ancient part of EHZ, called ARZ, which is what you see in the background when you're playing in EHZ. And remember those big, leafy trees in ARZ? Well then, that explains WZ. And let's say that HTZ is the cliffs you see in ARZ. A few years later, Sonic returnes to the cliffs which are now Windy Valley! Call it crazy, but first, just think about it...

*moments later- attacked*

 

I've always thought it to be like this:

ARZ- Present
HPZ- Good Future/Past
????-Good Future/Past(Whichever HPZ wasn't =P)
MCZ-Bad Future

????- Past
CNZ- Present
????- Good Future
OOZ- Bad Future

DHZ- Past
HTZ- Present
EHZ- Good Future
????- Bad Future

WZ- Past
MZ- Present
CPZ- Good Future
GCZ-Bad Future