When was the last time you actually sat down and played the NES version of Super Mario Bros.?
It's probably been years, right? Well since you're not working that hard anyway this Friday morning, why not flush what's left of that productivity right down the toilet and start the weekend early. Full-Screen Mario is an HTML5 remake of the original Super Mario Brothers.
All of the original levels are available, and you are also able to play through literally millions of possible random maps. Fancy yourself an NES god? Create your own stages using the level editor. Best of all, this whole project is open source and free. Follow the link right here to see how much you still remember.