The Trilogy
The classic progression from beginner to master. Hone in your addition and pattern recognition skills as you advance from 4x4 to 5x5 to 6x6 grids for a total of 303 puzzles! Each step in grid size naturally increases the difficulty of solving and within each book the difficulty increases as you progress, creating a steady uphill climb through the trilogy.
This Bundle includes Frequency All Fours, All Fives, and All Sixes.
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