Cross Math Puzzles Enjoy a unique blend of Sudoku-style logic and mathematical thinking with these engaging Cross Math puzzles. Each grid challenges you to place the numbers 1 to 9, using each number only once, while satisfying the given mathematical results. As you solve, the puzzle gives you a natural way to double-check your progress: track the missing numbers, compare them with the required row and column results, and use logic to narrow down each move. This creates a satisfying balance of reasoning, calculation, and self-checking—making every puzzle both challenging and rewarding.