Η Full Screen Mario developed it Super Mario Bros (remember the Nintendo game from the 80s) to HTML 5. This practically means that Mario, Luigi and the whole gang is coming in your web browser.
The site was created by Josh Goldberg and allows users to currently play the original levels of the game using the keyboard darts or create their own maps using a flatbed editor, as Mashable says.
This version uses the same music and animations as the old video game, but it only works with Chrome.