This is a working clone of Super Mario Bros. (with some missing features ). It was made thanks to the VRAM buffers feature (only available in experimental builds), the game runs quite smoothly and uses the Computronics Sound Card to play music on the same computer. It loads sprites from .bmp files, levels from Tiled (a free level editor) .json file and music is in some custom format that can be converted from MIDI files. This makes the game quite easily moddable.
Source code