It’s that strange time of year, the lull between Christmas and New Year, when you’re not really celebrating but not really working either. So, how about you wrap your brain around the world’s hardest ...

Get the latest NYT Pips answers and hints for October 23, 2025, across Easy, Medium, and Hard puzzles. Solve today's Equal, Less Than, and Number challenges with our official solutions.

As an academic discipline, logic is the study of reasoning. Logic puzzles, therefore, involve making a series of inferences ...

This week’s puzzle is difficult. Not because it has an exceedingly complicated solution, but because the idea that underlies it is deep and ingenious. I only know of one method to solve it, but I’m ...

The 'hardest logic puzzle in the world' has left many utterly baffled, with scores of people throwing in the towel after mere moments of attempting to solve it. The notorious blue eyes conundrum has ...

People have been left scratching their heads over the 'hardest logic puzzle in the world', with many admitting defeat just a few minutes in. The blue eyes brainteaser has been shared on social media ...

As promised yesterday… Raymond Smullyan has created ever-more-baroque variants of the following problem: Two guardians watch over a fork in the road. One path leads to safety, the other to a grisly ...

And you’ll get the answer “ja” if and only if the truthful answer to Q is yes. This is true whether you ask the question of Knight, Knave or Chaos.