Come to think of it, even a stupid one gets the gears in our brain moving. From simple riddles and puzzles, the site has lots of logic, math, and science puzzles to keep your brain on overdrive. The riddles at ThinkRiddles.com are more for children than adults. The site requires a free registration.
Welcome to the world's largest web site devoted to logic puzzles! Feel free to solve online just for fun, or, for an added challenge, register a free account and.
Books are available at many stores and a number of websites offer free Sudoku games, you can even find apps for your phone or tablet.
Additional Practice. Sharpen your skills with these quizzes designed to check your understanding of the fundamentals. Puzzles · Games · Paradoxes.
User submitted and ranked brain teasers, riddles, quizzes, trivia, logic problems and mind puzzles. Free online games and message boards.