Here's a bug in Language's "Little puss" mode. During some plays I explored the whole floor but, I can't open the 9 door because I can't find the 9th Language notebook. I think one of it's possible spawns is in the Pizza room or the Server room, both of which are locked. Can you unlock the doors for "Little puss" mode or remove the spawns? I think the same happens with one of the Math notebooks too.