
Frequency All Fours
101 Math Puzzles to Train Your Brain
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Sharpen your brain with NEW number logic puzzles! Your addition and pattern-recognition skills will be put to the test as you work through 100 4x4 puzzle grids plus a BONUS 5x5 puzzle, ranging in difficulty from Learner to Teacher. Each handmade puzzle has one unique solution that can be solved from only the given clues . Are you up for the Frequency Challenge?