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Logic, math, everyday and lateral-thinking riddles — each one paired with a step-by-step visual walkthrough of the solution, right in your browser.
Measure exactly four litres with only a five-litre and a three-litre jug.
Get four people with different speeds across a night bridge, sharing one torch, in the least time.
Two ropes, each burning an hour but unevenly. Measure exactly 45 minutes.
Blue and black socks jumbled in a drawer. How many grabs guarantee a matching pair?
A camel hauls bananas to market but eats them as it walks. How many survive the trip?
One of eight bottles is poisoned. Three tasters and binary code find it in one day.
Find the highest safe floor in a 100-storey building with just two eggs — in as few drops as possible.
100 lockers, 100 passes of toggling. Which ones end up open?
A monk climbs up one day and down the next. Is there a spot he passes at the same time both days?