Instructions in scratchthinker's original.
UPDATED FROM ORIGINAL Original is below. Go see it! Updated parts: Three extra words in the whitelist Double spacing in the chat Warnings if words are not in the whitelist (doesn't work for now) or if they contain more than one word Secret code only known to scratchthinker or me (and hopefully no one else!???) Extra code for further remixes Not only can this sense if you are in the chat, it knows when you left