What levels would you change in the game? I always told my friends that I think Sonic Generations is great, but it has too many city levels (Radical Highway, City Escape, Rooftop Run and Crisis City).

So, I would change Rooftop Run from Sonic Unleashed. Don't take me wrong, this is a beautiful level, but I would've put Cool Edge instead, since we don't have any ice themed levels in this game.

What about you?

Rooftop Run ? No. You don't touch it. It basically one of the apex modern Dash levels. You just don't touch that.

Actually, you don't touch any of them and simply add content instead. Wouldn't it just be better

Ummmmmm... none? There's no levels I actively dislike. You could always add more, but since the game is like... already made, it doesn't seem like there's a need to take out any. Would like a level from Secret Rings which I feel is an underrated game.

Oooh now that's a great idea, remaking classic levels from the two Story Book games would be fun since they both have quite great aesthetic to them. Actually they could have one of the "world" be composed of 2-3 stages of these two games.

Also, since "Shadow" is in the title. Gotta have a remade(and better) stage from Shadow the Hedgehog. 

The ideas of new content really make themselves heh 

One of the segments from the Sonic X Shadow Generations trailer reminds me of Westopolis.

I can also see they remake levels from Shadow in Sonic Adventure 2 and Sonic The Hedgehog 2006.

I despise the clock section of Rooftop Run (Classic). Either replace both acts with a different stage from Sonic Unleashed or tweak what's already there.