That’s not entirely relevant, but it’s also the name of a puzzle format created by legendary Japanese puzzle publisher Nikoli. Like so many other puzzling conceits, it begins on a square grid, with ...

Turn each of these to 2, 4, and 1, respectively, and the laser pointer will reveal the correct symbol for the first combination on the lock.

In only its second year, the International Logic Olympiad is already booming as logic becomes more and more crucial in our ...