规则Rules：
标准数独基础上，每种颜色的区域内数字是一组1~6不重复。
Classic rules applied. Additionally, numbers 1~6 cannot repeat in each colored region.
◆例题 Example
◆在线涂鸦 Draw it Online
◆在线做 Do it by CTC
◆在线做 Do it by Penpa
