It was only a matter of time, but this looks totally rad… via joystiq:
Everyone can pack up and go home, because the pinnacle of all human achievement has been reached. Mari0, that Super Mario Bros./Portal mashup we caught wind of last August, has been completed and is now available for free on PC, OSX and Linux.
Developed by Stabyourself, Mari0 is a complete recreation of the original Super Mario Bros., with one vital difference: This time, Mario is packing an Aperture Science Handheld Portal Device. The game features simultaneous four-player co-op, a level editor, 33 hats for Mario to wear, free DLC, a Minecraft-esque toolbar for on-the-fly block creation and a slew of other hilarious modifications.
Happy Monday — good luck getting any work done now!