It is a temporary room for certain parties/events in Club Penguin Rewritten. It may or may not return in the future.
The Monster Room was a party room in Club Penguin Rewritten that appeared at the Halloween Party 2017 and Halloween Party 2019. This was at the end of the Dark Chamber where players could obtain the free Pile O' Candy in 2017 or the Swamp Monster in 2019.
|Dark Chamber (2017)
Swamp Maze (2019)