g G ยท G. Gottstein
| title | ISBN-13 | year of publication |
|---|---|---|
| Math Perplexors: Deductive Logic Puzzles, Level C, Grades 5-6 | 978-1-933054-64-3 | 2007 |
| MindWare Grid Perplexors: Level B | 978-1-933054-06-3 | 2005 |
| MindWare Math Perplexors: Basic Level | 978-1-933054-79-7 | 2008 |
| MindWare Math Perplexors: Level B | 978-1-933054-63-6 | 2007 |
| MindWare Perplexors: Basic | 978-1-892069-13-9 | 1999 |
| MindWare Perplexors: Level A | 978-1-892069-14-6 | 1999 |
| MindWare Perplexors Logic Puzzles: Grid Perplexors Level A | 978-1-933054-05-6 | 2005 |
| Perplexors: Level B | 978-1-892069-15-3 | 1999 |