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 ...

As an academic discipline, logic is the study of reasoning. Logic puzzles, therefore, involve making a series of inferences and assessing them using reasoning. Easier logic puzzles for kids tend to ...

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 ...

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 ...

The answer to Tuesday’s puzzle, then. Remember that the puzzle is: There are three guardians, A, B and C. Their names are Knight, Knave and Chaos. Knight always speaks truly, Knave always lies. Chaos ...