等和Equal Sum

标准数独基础上，×号表示其左上角和右下角的数字之和，等于其右上角和左下角的数字之和。符合条件的情况被全部用×号标记。Classic rules applied. Additionally, at some intersections of two crossing grid lines, a cross symbol is given. The sum of the top-left digit and bottom-right digit is equal to the sum of the top-right digit and bottom-left digit. All possible crosses are given.

赛事频率 较低

多出现于日本数独锦标赛。