Put your brainpower to the test with this challenging series of metal brainteasers.
This demanding set has four metal puzzles to stump you, each designed by a cunningly clever boffin. Watch out for the dead end in the Nipper and you only need two moves to solve the Twist. The Claws can be solved in two ways and the Rings are impossibly possible, until you know the simple answer! Can children solve these puzzles more easily than adults - the challenge is on!