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This is volume 4 of Mykola Krylov's Suguru series: 600 hard Suguru puzzles in a 146-page paperback. Suguru is a grid logic puzzle where you fill irregular regions with digits so no same digit touches, even diagonally, and the number of cells in a region tells you which digits it holds. The book is all puzzles with no instruction section, so it suits solvers who already know the rules and want a large stock of hard grids. Against rival Suguru books it wins on sheer count and difficulty; against general logic-puzzle collections it is narrower and less forgiving for beginners.
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Lowest price we've seen: $11.99 on Nov 10 at Walmart. Tracked across 1 store since Nov 10.
The Giant Book of Logic Puzzles: Suguru 600 Hard is a paperback puzzle book by Mykola Krylov. It contains 600 hard Suguru puzzles across 146 pages.
This is Volume 4 in The Giant Book of Suguru series. It was published in English by CreateSpace Independent Publishing Platform in September 2018. The book is classed as non-fiction under Games & Activities, and its age group is listed as adult, teen and child.