Loading…
Logic, math, everyday and lateral-thinking riddles — each one paired with a step-by-step visual walkthrough of the solution, right in your browser.
One of eight coins is heavier. Pin it down with only two turns of a balance scale.
A game show, three doors, and a counter-intuitive truth: switching doubles your odds.
Five ruthless pirates split 100 coins by vote. How much can the captain keep?
Scale the counterfeit-coin hunt to twelve coins — still just three weighings.
A line of prisoners in red or blue hats. One clever signal saves almost everyone.
How few people does it take for two to share a birthday? Far fewer than you'd think.
Four cards, one logical rule, and the classic trap of confirming instead of falsifying.
A family has two kids, at least one a boy. The chance both are boys isn't ½.
Two suspects, one choice each. Why rational self-interest lands both in worse cells.