Not the cube, but the PUZZLE of
why I couldn't solve the cube.
The Big Bang Theory Season 12, Episode 19
where the last PUZZLE gives the winner
Sheldon's contact information.
The Big Bang Theory Season 9, Episode 8
Which, other than its
surprisingly fun PUZZLE page,
The Big Bang Theory Season 7, Episode 17
But we haven't
finished the PUZZLE.
The Big Bang Theory Season 7, Episode 3
"When you're doing a PUZZLE,
The Big Bang Theory Season 7, Episode 3