Hmm, see, I don't know much about copyrighting, but I'm being told that I should not make a non-commercial Mario game due to copyright issues? I don't see what's wrong here, I'm not making any off it, and there are plenty of games based on copyrighted stuff, like ESF (DragonBall Z Half-Life mod), and there are a lot more but naming them all wouldn't help any, so I'm just here to know why this would be a bad idea.