Criminal mastermind and evil genius Professor Fiendish has finally achieved his ultimate goal - a Murderous Maths book all to himself. And in a desperate attempt to warp the brains of readers everywhere he has filled it with utterly diabolical puzzles.

Readers must pit their wits against their favourite arch enemy and take a trip to the Megavolt Vaults.

They can try their hand at the Darts of Doom or play a game of Pass the Posion, before facing the ultimate horror - the bottom of Fiendish's fridge.

Remember, it's not called Murderous Maths for nothing.