Double click the flag. Controls WASD or Arrows to move. Remix and make your own levels! :) There are currently 5 levels, more coming soon!
It is really slow on full screen. Credit to @JamesOuO and Nintendo. This is to celebrate 30 years of Super Mario Bros. 8/6/2015 I fixed the glitch with the locks (again)! 8/6/2015 I realized that the glitch is not fixed 7/12/2015 I fixed the glitch with the locks