Contains 142 activities in relation to puzzles. As well as puzzles, there are also games, tricks, models and explanations of various phenomena. The topics range... » 

Contains 142 activities in relation to puzzles. As well as puzzles, there are also games, tricks, models and explanations of various phenomena. The topics range from number manipulation through happy and amicable numbers, coin puzzles, and picknicking bears to building shapes with cubes. «