   strategy for floors and star + incline and decline.
  Hi folks!Well. finally collision detection and collision response on walls are done. But now i need a good strategy for handle gravity, jump, walking on stairs etc.i have allready made this work, but i think my code is rather messy with lots of exceptions, not a general nice method.One specific question is how to handle floortiles that can move vertical (up/down) and horizontal (left/right)?i guess i must use logic like closest-floor and then push player up against the gravity if the player is on floor.Any ideás is welcomed.   
  what you usually have, is a 'step-up' and a 'step-down' routine. It's sort of a custom solution that depends on the game and what you want to achieve, but here's an article.EDIT : it's on Gamasutra. Not sure if you have to register. It explains how they did it for MDK2.   