V2: Play as Luigi! Press "1" for Luigi and "0" for Mario! Use the arrow keys to jump and move. "S" to sprint and throw fireballs in fire mode. "V" shows and hides the Volume bar for music. It works almost like the original Super Mario Bros. You can't kill Enemies by hitting the block below them (yet).
I used grapics and sounds by Nintendo. I don't own them and just used them for convenience. The basic for the platformer script is by @cobraguy. Please tell me if you find a bug. Yes, it's just two stages and I'm working on more. If you want to create a custom level, remix this project and do it.