Mathrax consists of a square grid. The goal is to fill in each cell with numbers from 1 to N, where N is the size of the puzzle's side. No number may appear twice in any row or column. Circles with additional conditions may be situated on intersections of lines inside the grid; a circle may contain:
| Author: Jeff Heldt |
| Publisher: Independently Published |
| Publication Date: Aug 26, 2018 |
| Number of Pages: 116 pages |
| Language: English |
| Binding: Paperback |
| ISBN-10: 1719899207 |
| ISBN-13: 9781719899208 |