Prepare to waste your day — scratch that, month. Mario, Luigi and the whole gang just invaded your web browser.
Full Screen Mario has updated Super Mario Bros. from your '80s Nintendo console to HTML 5.
See also: Vine Video Recreates Super Mario Bros. With Food

The site, created by Josh Goldberg, lets users play through the original levels (using the keyboard's arrow keys) or create their own maps using a level editor. Don't worry about authenticity being compromised; this version uses the same music and animation as the old-school video game.
Go on. The Mushroom Kingdom awaits.
BONUS: Now and Then: 10 Classic Video Games That Got a Major Upgrade
1997-2013
1996-2013
MASHABLE COMPOSITE, IMAGES: TOMB RAIDER
2000-2012
MASHABLE COMPOSITE, IMAGES: WWE
1986-2013
MASHABLE COMPOSITE, IMAGES: NINTENDO
1988-2013
MASHABLE COMPOSITE, IMAGES: EASPORTS
2003-2013
MASHABLE COMPOSITE, IMAGES: ACTIVISION
1991-2013
MASHABLE COMPOSITE, IMAGES: ACTIVISION
1987-2013
MASHABLE COMPOSITE, IMAGES: SQUARE ENIX
1998-2013
MASHABLE COMPOSITE, IMAGES: GAME FREAK
2000-2013
MASHABLE COMPOSITE, IMAGES: EA GAMES
Image: Flickr, JD Hancock