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Sudoku Puzzle Book is a crowded but proven KDP niche in 2026. Demand signals are moderate across search and social platforms, while competition is heavy — 1,000,000 published titles already compete here. Opportunity score: 36/100. Success here depends on targeting specific sub-niches rather than the broad keyword.
Based on live market data — Updated this week
*Est. based on this niche's Opportunity Score (demand ÷ supply ratio across Amazon, YouTube, Reddit, Wikipedia & Google). Illustrative only — not a guarantee of income. Actual results depend on your effort, execution, and market conditions. See our income estimate methodology →
Real data pulled from public sources — Updated this week
Real questions from Reddit threads and Google, Bing & YouTube searches about this niche
Use puzzle generators like Sudoku Maker or Python libraries to create grids, then format them in Word or Canva, and publish via KDP as a low-content book.
The tools we'd use to go from idea to first product:
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