This will allow you to make your own Super Mario Bros. levels and play them. I already started programing this about two weeks ago. I've already added the following:

basic mario blocks (bricks, ? blocks, goal posts, etc.), level editor, the ability to play the levels you make (as of now the levels scroll pretty smoothly, unless you add lots of enemies at once), goombas, green turtles, red turtles.

It is still going to be awhile before I am finished with this.

If there is one thing in petit computer I'm really bad at, it's mml. If anyone is good with mml I would really appreciate it if they could create some songs from the super mario bros sound track.