I know that Sonic 1 had only one layer for tiles -- which is why there are no places in the game where paths cross over themselves (except...
Messing around at the very beginning of Sonic 3, I took some time to scrutinize these quarter-pipe ramps in Angel Island act 1, and noticed some...
In LBZ act 2, there are convex 90 degree curves that Sonic can run on -- and when he does, it seems impossible for him to run "too fast" so that...
Here in the Sonic Physics Guide, it says that every tile has an associated height masks and angle. I've managed to extract all of the tile shapes...
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