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.

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

Now and Then: 10 Classic Video Games

Image: Flickr, JD Hancock