Secret Rooms
From Tiny Rogues Wiki
Secret rooms can be identified by looking out for "X" marks on the floor. Placing a bomb near the "X" will reveal stairs that lead to another room.
Not every floor contains one but in every run at least a few secret rooms can be found.
![Player standing next to a hidden secret room.](/wiki/images/f/ff/Secret_Room_Example.png)
![A well hidden secret room.](/wiki/images/8/87/F3secret.png)
There is a perk that can be chosen in the Mastery Tree that adds sparkles to any hidden room making it much easier to see when they are present within a room.
Another mastery perk guarantees one hidden room on each floor up to the 10th.