Title: The GCHQ Puzzle Book II, Author: GCHQ
Title: Brainteasing I Q Puzzles, Author: Chartwell Books
Title: Solve It Like Sherlock: Test Your Powers of Reasoning Against Those of the World's Most Famous Detective, Author: Stewart Ross
Title: Greatest Puzzles Ever Solved: 200 enigmas that have challenged mankind, from the dawn of time to the present day, Author: Tim Dedopulos

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