If you're a Portal fan and love Super Mario Bros (who doesnt?!) then this is the ultimate mod! This Super Mario Bros game was built completely from scratch and has the 1985 classic feel except you get a portal gun! :) This Portal Mario Bros also features 4 player coop with everyone rocking a Portal gun. Features include: Complete recreation of Super Mario Bros, Elements from Portal, Portal guns that shoots portals, 4 player simultaneaous co-op, level editor, 33 different hats and downloadable mappacks! This is available for Windows, Linux, OSX and Source! Head over here to download your copy.