Amazon prints, ships, and handles everything — you collect royalties on every sale. Here's the exact playbook for turning simple puzzle books into a royalty stream.
What is KDP?
Kindle Direct Publishing is Amazon's self-publishing platform. You upload a book once: Amazon prints each paperback only when someone orders it (print-on-demand), handles shipping and customer service, and pays you a royalty on every sale. No inventory, no upfront printing costs, no publisher gatekeepers.
The play: dead-simple puzzle and activity books — sudoku, word searches, coloring books. Cheap to make with free tools and AI, they sell year-round as gifts, and every finished book is a little royalty machine that pays for years. No audience needed — Amazon's search is the distribution.
The DIY playbook
From blank page to live on Amazon — the whole run:
Pick a niche with gift-buyers. "Large print sudoku for seniors" beats generic "sudoku" — gift buyers search for the person, not the puzzle. Check Amazon's bestseller lists in puzzle categories for proof of demand before you commit.
Generate the puzzles. Sudoku: a short Python script can generate hundreds of unique, solvable puzzles (with answer keys). Word search: themed word lists plus a free grid generator. Coloring: AI image generators for line-art pages — then zoom-check every single page and regenerate anything with garbled faces, hands, or text.
Format the interior to KDP specs. A common trim is 8.5" × 11". Set proper margins with extra gutter on the binding edge, embed your fonts, and export a print-ready PDF. One formatting rejection can cost you days — visually verify every page before uploading.
Design a cover that looks human-made. Full-color wraparound cover (front + spine + back). Spine width = page count × 0.002252" for white paper. Study the bestselling covers in your niche and match their bar: colorful, eye-catching, readable as a thumbnail.
Publish and price it right. Upload interior + cover, choose 3 categories and 7 keyword phrases buyers actually type, and price for profit — e.g. $7.99 on a ~120-page black-and-white book nets roughly $2.40 royalty per sale after printing costs.
Copy-paste prompt: your KDP coach
Your unfair advantage: paste this into any AI assistant and get a personal KDP coach that walks you through your own book, step by step:
Act as my KDP publishing coach. I want to self-publish a [SUDOKU / WORD SEARCH / COLORING] book on Amazon KDP as a paperback income stream.
Walk me through this in order — ask me questions before moving to the next step:
1. NICHE: suggest 3 specific niches with clear gift-buyers (e.g. "large print sudoku for seniors"), with pros and cons of each.
2. PUZZLES: explain exactly how to generate 100+ unique puzzles for free — a Python script approach for sudoku, a word-list method for word search, an AI line-art workflow for coloring (including how to QA every page).
3. INTERIOR: give me the exact KDP specs for an 8.5" x 11" paperback — margins, gutter, bleed, fonts, PDF export settings.
4. COVER: explain the front/spine/back layout, the spine-width formula (page count x 0.002252" for white paper), and what makes a cover readable as a thumbnail.
5. UPLOAD: the KDP listing checklist — title, subtitle, series, 3 categories, 7 keywords, and pricing math for roughly $2.40 royalty per sale.
Start with step 1. Be concrete — no fluff.
One click, then paste it into ChatGPT, Claude, or any AI assistant.