其实只要把门槛设成只有需要的人才能通过的的puzzle 就可以公开传播了
就好像哈利波特的魔法学院霍格沃茨可以把入口设在公共运输站一样
CleverLibre Social is an inclusive social instance for open discussion, learning, and community. All cultures welcome. Hate speech and harassment strictly forbidden.