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ThinkFun Square by Square Brain Teaser Ages 8+ 
6 green pieces and 8 blue pieces...how hard can it ...
Square Root Pentominoes Brain Teaser Puzzle, Ages 8+ 
Each piece, called a pentominoe, represents one of only 12 ...
Recent Toys IcoSoku Brain Teaser Ages 7 and up 
This puzzle is maddening addition!  Place the number buttons randomly ...