XV数独

An X between two cells means they total 10; a V means they total 5; a blank edge guarantees neither. That silent negative rule does as much work as the printed letters. Easy to pick up, surprisingly deep once you mine the unmarked edges.

有关完整规则、示例和解题技巧，请阅读完整的 如何玩XV数独 指南。

与所有数独变体一样，XV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。