I fixed the most of the issues from the previous demo, and changed the character select engine. Now you just press L and R to switch between members.
Remember to play 2-player mode! Enjoy! :D
SNN: Pretty decent, considering it's just a test. I couldn't really figure out how to get the blocks to work, so I'd clarify them more. The one level there is decent enough to play as well (second one is .. short.)
There was once a patch called the Stupid Powerup Patch which allowed you to switch between a powerup that gave you double jump height, the ability to run on air with a slow descent, and something that gave your spin jump temporary levitation like with Peach in SMB2US. This hack is a tech demo for that patch which no longer is hosted on the site. I rated the hack 1 star because the one level there is only exists as a testing ground for this patch. There are no challenges. Not recommended for entertainment unless you want to see an experiment in motion that never went anywhere.