There’s nothing quite like a maddening math problem, mind-bending optical illusion, or twisty logic puzzle to halt all productivity in the Popular Mechanics office. We’re curious people by nature, but ...

Hogwarts Legacy is full of secrets, and one of the first puzzles that confuses players is the locked number doors found around the castle. These are often called door puzzles, and they look strange at ...

We know all four shapes are the same before and after, but we assumed that the large right triangle also stayed the same size and shape. This assumption was our error! It turns out that the “before” ...