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This is the engine used in my game Jump!. I added comment, so everybody should be able to understand it (except for non-programmers :) ).
I posted this because many people were asking for the code of Jump!, so finally, here it is!
When you use one of the classes, please put my name in the description (just copy it off the documentation of the classes). Also, I'd love to see this in action, so tell me when you use it!
Feel free to leave a comment!