Sudoku: The Evergreen Low-Content Niche
Sudoku never goes out of style. It has consistent year-round demand, a huge senior audience, and buyers who happily collect Volume 1, 2, 3… of a series they like. That makes it one of the most reliable low-content niches on Amazon KDP — if you publish a clean, well-organized book.
🔢 Step 1: Generate Puzzles by Difficulty
Use the Sudoku Generator to create unique, valid puzzles with guaranteed single solutions — no duplicates, no unsolvable grids. The key is organizing by difficulty:
- Easy → Medium → Hard → Expert sections, clearly labeled.
- 100–200 puzzles per book is the sweet spot for perceived value.
- Place all answer keys at the back, numbered to match each puzzle.
📐 Step 2: Format a Clean Interior
Readability is everything in a sudoku book. Recommended setup:
- One puzzle per page, large grid, generous margins.
- 6×9 or 8.5×11 trim — go larger for "large print" editions aimed at seniors. (trim size guide)
- B&W interior to keep printing costs minimal.
When your page count is final, get your cover spine width from the Spine Width Calculator.
💰 Step 3: Price & Validate
Sudoku books typically sell for $5.99–$7.99. Confirm your profit with the Paperback Royalty Calculator, and check competition with the Niche Research Tool — "large print sudoku for adults" and "sudoku for seniors" are strong, less-saturated angles.
🎨 Step 4: Cover & Keywords
Show a sample grid on the cover, state the difficulty range and count ("200 Puzzles — Easy to Expert"), and emphasize "Large Print" if that's your angle. Useful keyword phrases: sudoku puzzle book, large print sudoku, sudoku for adults, brain games, sudoku for seniors.
Turn One Book Into a Catalog
The winning sudoku strategy is a series: easy-only editions, expert-only editions, large-print editions, and numbered volumes. Each new title reuses the same template and the same generator, so your time-per-book drops fast while your catalog (and royalties) grows.
→ Make a Sudoku Book | Check Your Royalties | Puzzle Book Master Guide