Play Mario Bros. On Your Browser

If you head over to FullScreenMario.com you can play a beta version of the original Super Mario Bros. It was created by  Joshua Goldberg a computer science major. I'll tell you right now that if you like to clear the level 100% then don't miss the jump when facing two bad guys because the hit box sucks and you'll die while shrinking. Otherwise it's actually pretty fun to see it in full screen. Source