I personally hate servers with a whitelist so the idea i had was a greylist that lets people join the server so they can read the rules and hidden inside the mass of signs with rules on them is a word that once uttered automatically adds them to the whitelist. This way people can join and only join the whitelist if they read the rules, they could just read that one sign, but whats the odds of them reading that 1 out of 20 without reading the rest? I have absolutely no idea how to code at all and i turn to you.
