Entities

Currently, there are 13 entities (+1 upcoming entity) in Rooms & Doors (if excluding Red Skull then 12), all of which the player must avoid throughout their run. Some have certain gimmicks that require the player to avoid them in alternative ways.
==Entity List==
Note that this is listed in numerical order, not by when an entity spawns.<tabber>
|-|Entities=
Entity name 	Appears in rooms 	Behavior 	Strategy/How to avoid
The Void (A-10) 	A-9 and beyond. 	Moves up one room when the player enters a new one. 	Don't fall behind.
Shell (A-40) 	A-21 and beyond. 	Spawns in a random locker and denies entry to anybody who tries to enter its spot. 	Do not interact with it's locker, unless you need it.
The Darkness (A-50) 	A-21 and beyond. 	Attacks players who have been hiding in lockers for too long (The Darkness cannot appear under tables). 	Do not hide for too long, and time your hiding with the rushing entities.
The MultiMonster (A-60) 	A-20 and beyond. 	Rushes towards the most recently opened room, killing anybody within its line of sight. 	Hide when you hear it.
MultiMonster Prime (A-60')	A-50 and beyond. 	Disrupts the player's flashlight when it spawns. Behaves exactly like A-60. 	Exit and reenter your hiding spot when your light becomes disrupted.
Paralysis (A-90) 	A-190 and beyond. 	Heavily injures players who don't stop moving when it appears on their screen. 	Stop moving when it appears.
Paralysis Prime (A-90') 	A-190 and beyond. 	Appears after Paralysis and Heavily injures players who don't stop moving when it appears on their screen. 	Stop moving when your flashlight flickers after Paralysis.
Pnevma (A-100) 	A-101 and beyond. 	Attacks players who emit too much sound and/or light. 	Do not run and/or have your light on while near it.
Happy Scribble (A-120) 	A-120 and beyond. Stops spawning past A-200, but starts spawning again after A-500.	Spawns in-front of the most recently opened room, and moves towards alive players. Emits metallic banging sounds. Behaves similarly to A-60. 	Hide in a locker until it goes away. The Darkness cannot appear for A-120, but when A-120 makes a return for rooms 500-998, then The Darkness can start appearing for it.
Insidæ (A-200) 	A-200 and beyond. 	Silent variation of A-120. Stops all ambience when it spawns, along with producing a bang sound and making your entire screen gray. 	Same strategy for A-120, but The Darkness will start appearing again after room 500 for A-200 and A-200', so be careful.
Insidæ Prime (A-200') 	A-200 and beyond. 	Blue variation of A-200, disrupts flashlights. Only spawns after an attack from A-200. 	Refer to "A-200".
Kalypto (A-250) 	A-250 and beyond. 	Attacks players who aren't hiding under a table, and if you hide in a locker, blocks people from exiting the locker for long enough so The Darkness can get them.	Hide under a table if one is available to you. Recommended to hide in a locker as late as you can so you can exit before The Darkness can get you.
|-|Misc Entites=
Entity name	Appears in rooms	Behavior 	Strategy/How to avoid
Red Skull 	Anytime. 	Failsafe for when room generation fails/player goes out of bounds. Transports exploiters to The Serious Room.	Cannot be avoided, as it acts as a failsafe.
|-|Upcoming Entities=
Entity name 	Appears in rooms 	Behavior	Strategy/How to avoid
A-300 (Unreleased)	A-300 and beyond.	Unknown 	Unknown
</tabber>