KDP categories · Top KDP authors
Zack Guido: Amazon KDP author data
As of Nov 6, 2026, Zack Guido has 6 books on Amazon, 5 of them on a best-seller list in the last 30 days (best rank #9), mostly in Math Games, Jokes & Riddles, Geometry & Topology.
| Median price | $9.99 |
|---|---|
| Price range (middle 50%) | $9.24 – $9.99 |
| Median reviews | 640 |
| Total reviews | 5,791 |
| New books (30 days) | 0 |
| Breakout books (30 days) | 0 |
What stands out
- 83% of the catalog made a best-seller list in the last 30 days: the whole backlist sells, not one hit.
- Median price $9.99, 17% below the median of their main category, Math Games.
Zack Guido's best-ranked books
-
The Super Sudoku Book For Smart Kids: A Collection Of Over 200 Sudoku Puzzles Including 4x4's, 6x6's, 8x8's, and 9x9's That Range In Difficulty From Easy To Hard!
by Zack Guido
- Price$9.99
- Rating4.8
- Reviews817
-
Of Course! The Greatest Collection Of Riddles & Brain Teasers For Expanding Your Mind
by Zack Guido
- Price$3.99
- Rating4.4
- Reviews2,036
-
The Amazing Book of Mazes: 75 Handmade Mazes for All Ages
by Zack Guido
- Price$9.99
- Rating4.8
- Reviews91
-
Of Course!: The Greatest Collection of Riddles & Brain Teasers For Expanding Your Mind
by Zack Guido
- Price$8.99
- Rating4.4
- Reviews2,036
-
What Am I?: A Collection of Traditional Word Riddles – Deluxe Edition
by Zack Guido
- Price$9.99
- Rating4.6
- Reviews348
-
The Best Word Search Book Ever Made (So Far): 115 Word Searches In Large-ish Print For All Ages!
by Zack Guido
- Price$9.99
- Rating4.6
- Reviews463
- Published2018-11
-
Dr. Finn's Book of Solo Strategy and Word Games: A Collection of Single-Player Games for Adults and Kids (Dr. Finn's Books of Games)
by Zack Guido
- Price$14.99
- Rating4.9
- Reviews41
- Published2025-06
-
Dr. Finn's Book of Two-Player Strategy and Word Games: A Collection of Two-Player Games for Adults and Kids (Dr. Finn's Books of Games)
by Zack Guido
- Price$14.99
- Rating5.0
- Reviews7
- Published2026-04
Main categories
FAQ
How many books does Zack Guido have on Amazon?
KDPTop tracks 6 of their books; 5 made an Amazon list in the last 30 days.
Which categories does Zack Guido publish in?
Their books chart most often in Math Games, Jokes & Riddles, Geometry & Topology.
How does Zack Guido price their books?
The median price is $9.99; half of the books cost $9.24–$9.99.
Has Zack Guido released new books recently?
0 new books in the last 30 days.
About this data
Data comes from KDPTop's daily crawl of Amazon's public Best Sellers pages; medians use the latest list. The opportunity score (0–100, higher is easier to enter) combines the review barrier, the share of low-review books, list turnover, new-release share and price.