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Discover summer reading lists for all ages & interests!
Find Your Next Read
This book is structured like a staircase, not a pile.
Starting at Super Easy and building, level by level, through six stages, before easing you into true Easy difficulty across six more. By the time you reach puzzle 108, you're not the same solver who opened the book. You've actually gotten better. That's the whole point.
Inside, you'll find:
You don't need to be "good at math." You don't need prior experience. You just need a system that meets you where you are and moves you forward, one grid at a time.
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Take 20% off your first order
Enter the code below at checkout to get 20% off your first order