Preflight checklist
- Build the book to run the checks.
One theme per line. Letterfield makes every puzzle, the solutions section and a print-ready interior PDF sized for Amazon KDP paperbacks. Previews are free and watermarked; the Publisher licence (US$19 one-time) removes the watermark and adds commercial rights.
Publisher licences are not on sale yet: checkout opens at launch. You can keep building watermarked previews for free.