Printable Mathrax Puzzles

How to Solve a Mathrax Puzzle

Each puzzle follows the basic rules of Sudoku: the numbers 1 through 9 must appear once (and once only) in each column and row. The circled numbers and relational symbols tell you arithmetic relationships between the diagonal squares touching each circle. If a circle says "8+" that means that both pairs of diagonal squares touching that circle each add up to 8. If a circle says "E" or "O" that means all touching squares are even or odd, respectively. Each Mathrax puzzle has only one unique solution, and each can be solved using pure logic and basic arithmetic. Good luck!