Tadahiko Nagao · Tadeus Nawka · Tatzu Nishi · Tetsuo Nishio
| title | ISBN-13 | year of publica- tion | other author(s) | |
|---|---|---|---|---|
| Games Magazine Presents Paint by Numbers | 978-0-8129-2384-1 | 1994 | Games Magazine | |
| Higher Sudoku: New Challenging Variations from Japan | 978-1-932234-30-5 | 2006 | ||
| Magic Sudoku: mit neuen Variationen | 978-3-442-16892-7 | 2006 | ||
| More O'Ekaki: Paint by Numbers From Its Inventor | 978-1-932234-76-3 | 2007 | ||
| O'ekaki: Paint By Sudoku | 978-1-932234-31-2 | 2006 | Kenji Onishi | |
| Original O'Ekaki: Intelligent Designs from Its Creator | 978-1-934287-11-8 | 2008 | ||