Since Jay will be adding the Lost Levels eventually, here's an idea for even more playability. Add VS Super Mario Bros along with it! VS is the arcade version of SMB. It is basically a harder version of SMB with a few of the LL mixed in. Here's a link that shows the level arrangement and each one tells you how VS is different. http://strategywiki.org/wiki/Vs._Super_Mario_Bros. Since all the levels would be completed, there would only be some editing and rearrangements of levels to do.