Condition: New,UPC: 9780312605148,Publication Date: Tue, September 1, 2009,Type: Paperback ,
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Once you've mastered the easy puzzles, it's time to take it up a notch!
Features: -200 medium-level puzzles using addition, sumtraction, multiplication, and division -Introduction and instructions by Will Shortz -Puzzles range from 4-by-4 to 6-by-6