 What's the deadliest backroom sub-level? Well, I'm glad you asked. There are hundreds of hidden layers and levels inside of the main backroom's areas that we all know and love. Some of them are safe, some of them are deadly, like level 0.1 or the red rooms, which of course is a sub-level of zero where everything turns red and you can hear strange entities and noises all around you. Red rooms is also virtually inescapable, so if you get sent there, you're stuck. The way you enter it is by wandering too deep and staying too long in level 0, but level 0.1 is a cakewalk compared to level 4.4. 0.4 is a small hidden section of the regular level 4. People who get sent here end up being trapped because once you go in, the entrance disappears behind you and the level then bends and warps your mind and isolates you from everyone, turning you into a twisted and mangled form of your previous self. Cool, what sub-level should I go over next?