Today’s NY Times “April fools” themed crossword puzzle was a real hoot. Solving it basically requires you to keep in mind one of the most important unspoken rules of crossword puzzles, and then do exactly the opposite.
Of course you need to figure out for yourself exactly what rule you are breaking. Because the rule that is being broken is an unspoken rule, the puzzle itself remains technically correct.
Diabolically clever. I love it!