In a 9 × 9 grid, a total of nine Arabic numerals from 1 to 9 filled the entire grid, requiring compliance
1 to 1 to 9 for each line, the location is not limited
2. Each column is used from 1 to 9, the location is not limited
3. Every 3 × 3 grid are used 1 to 9, the location is not limited