There are currently four known easter eggs in the room series. One is in all of the games except for the first Room, one is in The Room Two, the other two are in The Room: Old Sins.
Typewriter Egg
There are a few clues around the seance level in The Room Two that are keywords for the typewriter. Known keywords include:
- Null
- Death
- Life
- Light
- Truth
- Home
- Science
- Knowledge
- Power
- AS
- Prey
- Others
- Maggy
- Grayson
- Rigby
- Baia
- Hirst
- Whatsinthebox (whats in the box)
- Crowley
- Thecircle (the Circle)
- Demons
Feel free to add on to the list if you find anything else
Radio Egg
After finding the two radio messages in The Room: Old Sins, it is possible to change the frequency on the radio to find three frequencies. These are communications of The Circle.
Hint Egg
At the end of The Room: Old Sins, if the player waits to place the Null Sample in the case, three hints will come up. These hints reveal what the protagonist (Collector Hydrus) is planning on doing.
Game Paused Egg
In the game paused menu, tap on the game paused icon five times. This will take you to a spot that gives you the option to skip your chapter. In The Room: Old Sins, this allows you to select which room to start from. This menu is not available in the original Room. It is presumably a developer tool to allow the developers to skip levels to test later ones. The developers mentioned this tool in the help section of The Room: Old Sins.