Brain-training books
Thousands of sudoku puzzles, detective logic mysteries and word searches, chess tactics, and fascinating facts. Books for kids, adults, and seniors. Available on Amazon.
Ten sudoku books, from 4×4 grids for first-time solvers to extreme 9×9. Not sure which level suits you? Start with what each Sudoku difficulty level means, or compare them all by difficulty, grid size and print size →
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Perfect for beginners and anyone looking to relax while training their mind with classic sudoku challenges.
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Take your skills to the next level with medium difficulty puzzles. Ideal for players who want a balanced challenge.
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Master sudoku with challenging puzzles for experienced solvers who love intense mental workouts.
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Every level in one book: 1000 puzzles across 6 difficulties, from very easy warm-ups to extreme, with all solutions.
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Compact, portable edition with 150 puzzles: 50 easy, 50 medium and 50 hard. Keep your mind sharp on planes, trains, and cars.
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Easy-to-read sudoku with large print. Perfect for seniors who love puzzles and want comfortable gameplay.
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336 puzzles across three grid sizes: 120 4×4, 108 6×6 and 108 9×9, each size running from easy to hard, with a full answer key at the back.
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216 sudoku puzzles, 72 each of 4×4, 6×6 and 9×9, starting on 4×4 grids that use only the numbers 1 to 4, on large 8.5×11 pages with solutions at the back.
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250+ easy and medium puzzles across 6 levels of play, growing from 4×4 grids all the way up to full 9×9.
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400+ puzzles weighted towards the full-size grid: 234 9×9, 108 6×6 and 60 4×4, each size running from easy to hard, with a full answer key at the back.
Learn more →Not sure which to pick? Compare the two detective books → New to logic grids? Learn the deduction method step by step →
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40 original detective mysteries for adults and teens, solved with clues, a logic grid and deduction. Hints are layered and every solution is explained. Free pack of 3 printable mysteries available now.
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50 detective mysteries for adults and teens, hidden in word-search grids: the words you find are the evidence that names the culprit. Free pack of 5 printable cases available now.
Learn more →Two tactics books built from real games, one for kids and one for adult beginners. Try ten free chess puzzles for kids, with answers → Already playing online? Learn how to analyze your own chess games.
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1,008 tactics puzzles from real games, rated 400 to 1497 across eleven motifs, never more than two moves deep, with full solutions.
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504 chess puzzles from real games, in three rated sections: mate in one, forks, pins and skewers on large diagrams, with full solutions.
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Fix Your 3 Biggest Chess Weaknesses
Analyze your games, discover recurring mistakes, and practice for 15 minutes a day. An Android app we are building for players rated roughly 600–1600 in online Rapid; it is not available yet.
Fact and trivia books about America and its fifty states. See which of the three is which → Or print a free 50 states map quiz with answer key.
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Test your knowledge of American history from colonial times to the modern era. Engaging questions for all ages.
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Discover fascinating facts about the 50 states, landmarks, culture, and history. Perfect for curious minds.
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A fun fact and quiz book for kids ages 8-12. All 50 states across 8 regions, plus 80 quiz questions with answer keys. Free Family Trivia Night Pack included.
Learn more →Geography books for ages 6–12, from all 193 world flags and fifty places in Israel to a 100-puzzle trip around the world. Compare all five by scale, age and format → Or start with a free geography quiz or flag matching worksheet.
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All 193 UN member countries, one per page, with full-color flags, capitals, maps, quick stats and fun facts. Color-coded by continent. Free Flag Detective Activity Pack available now.
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A full-color atlas for kids ages 8-12. Every state gets its own page: flag, map, state shape, capital, nickname and three facts, plus eight region quizzes. Free 50-States Quiz Challenge available now.
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A full-color atlas for kids ages 6-12. Every region gets a two-page spread: flag, map, region shape, capital and three facts, plus a landmark drawn to visit and five area quizzes. Free Italian Explorer Activity Pack available now.
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A full-color photographic guide for kids ages 6-12. Fifty real places get a page each, from Jerusalem and Masada to the Negev craters and the coral reef at Eilat, with a real photograph of every one. Free Israel Explorer Activity Pack available now.
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100 original geography puzzles for kids ages 8-12 in ten stages from North America to Antarctica: mazes, codes, logic and map challenges, with a hint and an explained answer for every puzzle. Free Stage 11 bonus available now.
Learn more →Every book listed above is available on Amazon. Discover brain-training books designed for every age and skill level. Happy puzzling! 🧩