规则Rules：
标准数独基础上，框内数字是多位数质数（左→右，上→下）。
Classic rules applied. Additionally, numbers are multi-digit prime (left-right, up-down) in cage.
◆例题 Example
◆在线涂鸦 Draw it Online
◆在线做 Do it by CTC
◆在线做 Do it by Penpa
