The basic gameplay of the nine-square grid

  The nine-square grid, from the very beginning, uses a 3x3 checkered board. If you fill in the numbers from 1 to 9 in each box, each row, column, and two diagonals contain the number in increments or decrement. The key is to find a solution to fill in the numbers to meet the rules of the grid game. The next step will show you how to hack it.

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How to easily master the nine-square grid formula: Techniques for solving the nine-square grid