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 number and a sign of mathematical operation (addition, subtraction, multiplication, division) - a number is a result of an operation execution with numbers in diagonally adjacent cells.
A letter “E” (“even”) - all numbers in four cells are even.
A letter “O” (“odd”) - all numbers in four cells are odd.

The puzzle book contain:
• 200 Puzzles
• Handy 6 x 9 inch Book Layout
• 2 Puzzles per Page
• Ideal for both Beginners and Experts

In the book you will find a description and examples of solutions for all puzzles.
The book is for those who like logic and math problems. Decide, developing and improving.

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