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A detailed analysis of the implementation of the physics system in Sonic games: it runs efficiently on a 7MHz 68000 CPU based on predefined collision tiles and simple sensor rules, rather than real-time physics calculations. It also introduces design details such as level collision data, sensor system, dual loop implementation, and the author's progress on an Amiga port.
A tutorial explaining how to implement an overhead camera view for game maps in C64 BASIC, with optimization techniques.