The typical first entity you meet.
Who is A-60
The most common entity people first die to on their first blind playthrough.
Who is Rush
The earliest possible subfloor you must access to unlock the backdoor
Which is the rooms
The rush-like entity
Who is angler
The subfloor with a gun
Which is operation heartburn
The non-official entity that has doors origins which resides in the rooms
Who is A-90, A-120
The entity who chases players down relentlessly, also known for having many forms
Who is seek
The most annoying entity in the rooms considered by most people
Who is A-90
The dupe-like entity
Who is the good people (the p.AI.nter and the mask of sadness)
The subfloor known to be the hardest
Which are endless, endless firewall, the vault
The original design for A-120
Who is A-200
The entity reached at doors 50, 110, 125, and 175
Who is the figure
The timer related entity
Who is Haste
The halfway shop keeper who is also required for a separate ending
Who is Sebastian Solace (Z-13)
The easier version of the vault
What is the hunted
The entity you die to almost guaranteedly due to extreme speeds and requiring high reaction time
A-60, A-200
The only subfloor that has multiple entrances
Which is the outdoors
The chronological last subfloor
What is the outdoors
The badge unlocked for obtaining the secret ending
Which is "Stick to the Script"
What is the raveyard
The ending in rooms happens after you die at door __ or higher
Which is A-200
The amount of floors and subfloors
What is 5
The hardest subfloor achievement
What is A-1000 (aka my legs are killing me)
The most joked upon entity, a non-angler-variant
Who is pandemonium
The subfloor which you unlock after the main game
What is modified runs