More importantly -- boosting doesn't depend on physics whatsoever. In fact, it negates them. Whenever basically any stunt that involves spatial awareness/coordination is mentioned, @ChaddyFantome seems to dismiss it as "just a timing challenge" that can be performed with the boost or, in the Mario games, with some powerup. Maybe the argument is that Sonic doesn't require intricate motion play for progression very often. Which it doesn't, thank God: you can beat Casino Night's boss by accruing speed through spindashing or rolling on the sloped terrain and jumping off the tracks to hit Eggman or use the pinball flippers -- which is a lot riskier, but doesn't use "physics manipulation". But as you and @Zephyr have mentioned a lot of times, jumping while going fast at the top of a slope to do a big jump is playing around with physics, very much so: it just doesn't automatically connect to solving a challenge, framed as such by the game. That really doesn't matter, though, because Sonic stages don't typically frame challenges like that. Apart from the need to go from A to B, and that being the one thing you have to do, earlier Sonic games just generally let you be. How you're gonna do that is entirely your problem, and what we call "sections" can be entirely skipped or approached in any way. Emergent play is very much intended here, and I'm basically positive it's a lot more freeform than the question-and-answer syntax that we grew used to with basically all other games. (Except for S3&K, which has more definitive "sections" and expresses its challenges more clearly) In fact, this is Sonic's most distinctive feature, and also what generates all the criticism that Sonic got over the years back when "Sonic was never good" fad started. So anyway: you'll almost always depend on the physics and the level geometry to do stuff in classic Sonic, basic as that might be. Spatial awareness, sense of rhythm et al are the most iportant skills, and they are not a given. Boost (is an entirely different framework, which) calls for resource management first and foremost. The same applies to whatever powerup one might bring up from Mario.