
where the last PUZZLE gives the winner
Sheldon's contact information.
The Big Bang Theory Season 9, Episode 8

Relax, it's
a hard PUZZLE.
The Big Bang Theory Season 7, Episode 3

New PUZZLE, Ma!
The Big Bang Theory Season 4, Episode 19

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

each PUZZLE will lead you
The Big Bang Theory Season 7, Episode 3