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:
- 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.
logic puzzles for adults - logic puzzle books for adults - logic puzzle book - logic puzzle games - logic puzzle for adults - logic puzzle activity book - logic puzzle adult - logic puzzle grid - logic puzzle magazine - logic puzzle magazine for adults - logic puzzle workbook - logic puzzles for middle school - logic puzzle answers - logic puzzle books for middle school - logic puzzle brain teaser - logic puzzle beginner - logic puzzle daily - logic puzzle for middle school