Super Mario War
Wow, wow, wow. I just discovered this game tonight. It's basically a Super Mario four-player deathmatch. What could be cooler than that? It uses all the same images, sound and music of the Super Mario Bros series and has over 200 maps. ...and it's open source and runs on Windows, Mac and Linux. I hear it also can run on PSP and XBox, but haven't seen these rumors confirmed. Anyway, download it, give it a try and let me know what you think. :)