To minimize memory footprint, the 9x9 grid is not stored as a multi-dimensional array of objects. Instead, a flattened integer array is used: int grid[81]; This utilizes 324 bytes (assuming 4-byte integers) or less if short int is available. Bitwise masking is used to store "fixed" vs. "user-input" numbers within the same integer variable, reducing the need for secondary arrays.
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: If you need the text formatted for a book or layout, the Canva Sudoku Generator can batch-generate grids that you can customize with different fonts and titles. How To Create Sudoku Puzzles For FREE To minimize memory footprint, the 9x9 grid is