Quite a few games have been submitted that were built with the djrellik's SMB3 engine. This means that these games all share an identical engine, system, and other things common to the tool.
Me and Klobber have decided that it is ok for people to submit these games to the main site, as long as two criteria are met.
- Don't use the original levels that were included in the original program, for goodness sakes make your own.
- Give credit to djrellik somewhere in the game for the engine, because the engine was not your work.
SM did say that around the year that one of the Doom games was released, there were countless games made with that game's engine. So as long as these fangames aren't steals of the original game, they are ok.