规则Rules:
标准数独基础上,箭头指向其相邻格中,所有的最大数字。
Classic rules applied, arrow points all the max number adjacent to that cell.
作者Author:GGDumplings
◆例题 Example
◆在线涂鸦 Draw it Online
◆在线做 Do it by CTC
◆在线做 Do it by Penpa