规则Rules：
标准数独基础上，涂色格与其任一呈马步的单元格中，不能有相同的数字。
Classic rules applied. Additionally, no two cells that is a knight-step away and contains at least one colored cells can contain the same digit.
◆在线涂鸦 Draw it Online
◆在线做 Do it by CTC
◆在线做 Do it by Penpa
