|Professor Provolone's Picto-Puzzle|
|First appearance||"Lisa the Simpson"|
Professor Provolone's Picto-Puzzle, or simply Picto-Puzzle, is a brain teaser puzzle that Lisa couldn't answer in "Lisa the Simpson." The actual answer was 6. But this is not correct. The actual answer is a mirrored 6 backed against a 6.
When this episode came out (1998), going to a public college for 4 years was cheaper than buying a new Cadillac. Lisa says that the answer is not Prince's names. It is different now that Prince is dead (RIP).