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 ...

Optical illusions are one of the best ways to put your eyes and brain to the test. From confusing images to tricky number ...

Grab the calculator and solve one of the tricky puzzles of Blue Prince. If you’re deeply confused by the dartboard puzzle, here’s what you need to know to solve it. With some basic math skills, you’ll ...