I put up the first of many demos, the cloned version of Super Mario Brothers. Call it Super Scarfman, or whatever. You can find two versions of it on the demos page, one with all the tunable numbers set to zero (for learning purposes) and one that’s the feel of Mario (without the graphics and sound, for obvious reasons.) I recommend trying to recreate the feel of Mario from the untuned version; it’s an interesting and challenging exercise :).
Direct links here: