额外区域
对角线数独
两条主对角线也必须包含1–9
对角线数独的工作原理
Both corner-to-corner lines must hold nine different digits, giving the grid two bonus houses to scan. The 17 cells they cover are the most restricted on the board, so working the diagonals first usually cracks the opening. It feels gentler than the classic game at low levels, while expert grids hide their key move on the line you forgot to check.
有关完整规则、示例和解题技巧，请阅读完整的 如何玩对角线数独 指南。
标准数独规则仍然适用
与所有数独变体一样，对角线数独建立在经典的9×9基础上。每行、每列和每个3×3宫必须恰好包含每个数字1到9一次。变体约束是 添加在顶部 这些标准规则的一部分，从不替换它们。
如果你是数独新手，请先学习 基本规则和技巧 在尝试变体之前。