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 Wi...

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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



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