Gchq

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The GCHQ Puzzle Book
Penguin Books Ltd (2016)
AU$14.99

The PERFECT GIFT for anyone who loves a good head-scratcher - the original official puzzle book for...

The GCHQ Puzzle Book II
Penguin Books Ltd (2018)
AU$14.99

The GCHQ team's long-awaited second puzzle book - full of both harder and easier brain teasers -...