Welcome to boot camp for the brain. The perennially popular calendar that delivers a year of puzzles that are both addictive and tough enough to be sanctioned by Mensa. 365 Brain Puzzlers works your neurons to the max—each day an entertaining logic conundrum, word puzzle, spatial challenge, or math riddle designed to test the brainiac’s mettle: One clock loses two minutes every hour, and another clock gains two minutes every hour. If both clocks currently show 12:00, in how many hours will both clocks next show identical times?* Puzzle got you stumped? Don’t worry, answers and explanations are on the reverse of each page.

*180 hours