When counting squares in a grid, don’t stop at the smallest boxes; the bigger ones are hiding too. The rule is simple: In an n × n grid—where n is the number of squares both horizontally and ...

The number 9 can be written as a difference of two squares as 3 2 – 0 2 = 9 – 0 = 9. Can you find a different way to express it as the difference of two squares? Which numbers between 1 and 30 can be ...

I’m a big fan of the latest NYT puzzle game. Pips only launched about a week ago, but it seems like it’s already picking up steam. If you like playing dominoes—either the actual game or just lining ...