
Not the cube, but the PUZZLE of
why I couldn't solve the cube.
The Big Bang Theory Season 12, Episode 19

Did Sheldon and Amy give
you guys that PUZZLE, too?
The Big Bang Theory Season 11, Episode 12

But we haven't
finished the PUZZLE.
The Big Bang Theory Season 7, Episode 3

The first PUZZLE is a PUZZLE!
The Big Bang Theory Season 7, Episode 3

Your next PUZZLE is a riddle.
The Big Bang Theory Season 7, Episode 3