I have wasted quite a few hours tonite. I had no idea it is tomorrow.
Super Mario Brothers.
Plus a Portal gun.
:D
http://stabyourself.net/mari0/
Not just the entire Super Mario game, but they have a bunch of custom Portal puzzle levels, using the new mechanics from Portal2.
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"Once, during Prohibition, I was forced to live for days on nothing but food and water." ~ W. C. Fields