- 01Warm-upNine balls, one heavyFind the heavy ball with two weighings on a balance.Count the outcomes
- 02Warm-upThree switches, one bulbOne trip upstairs. Which switch works the bulb?Find a hidden signal
- 03Warm-upFour litresA 5-litre jug, a 3-litre jug and a tap. Measure exactly 4.Work backwards
- 04Warm-upWolf, goat and cabbageGet everything across the river without anything being eaten.Distrust the obvious move
- 05TrickyTwo burning ropesRopes that burn unevenly, a lighter, and no clock. Measure 45 minutes.Trust only the guarantee
- 06TrickyTorch on the bridgeFour people, one torch, a bridge that holds two. Cross in 17 minutes.Distrust the obvious move
- 07TrickyTen bags, one fakeOne reading on a digital scale. Which bag is full of fakes?Find a hidden signal
- 08HardTwelve coinsOne fake, heavier or lighter. Three weighings to find it and say which.Count the outcomes
Play
The games room
Classic logic puzzles you can actually play. Each one rewards a different way of thinking, and each has a hint for when you're stuck.