Framed Cube is a hollow 4x4x4 Rubik's Cube with a visible 2x2x2 Rubik's Cube inside. So you do not only have to solve the outer surface, but the inner cube as well. Concept suggested by Per Kristen Fredlund.
Watch the YouTube video
http://www.youtube.com/watch?v=Fs6NDIuIvag
Read at the Shapeways Forum
http://www.shapeways.com/forum/index.php?t=msg&th=3232
Read more at the Twisty Puzzles Forum
http://twistypuzzles.com/forum/viewtopic.php?f=15&t=18630
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