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Re:Metroid Source Code Expanded by jbermudes on Saturday October 15, 2011 @06:13AM (#3114549)
Sonic Retro has a writeup of the physics behind Sonic 2. Check it out, it's exactly what you're looking for and would be a good template to follow for other games.

http://info.sonicretro.org/Sonic_Physics_Guide

Re:Metroid Source Code Expanded by Impossible on Monday October 17, 2011 @01:23AM (#3119281)
Yeah I've seen that and it's excellent. My idea was basically to expand on that sort of stuff.