Published in association with the Turing Trust, this collection offers the codebreaking enthusiast a tough but enjoyable challenge. Follow in the footsteps of A

Published in association with the Turing Trust, this challenging collection of code puzzles will stretch, puzzle and entertain you for hours. It offers the puzz

Published in association with the Turing Trust, this challenging collection of number crunch puzzles will really put your numerical skills to the test. Follow i

"This collection of various types of IQ puzzles is divided into three levels of increasing difficulty, with the final level intended for the expert and as fiend