Bathrooms

The Lavatory is a location in BFB and Paper Towel.

It is the setting of Paper Towel and parts of BFB, most notably the Cake at Stake elimination scenes.

Indicator
The indicator at the top of each door seem to have three permutations:

Faucet
Near the left door there seems to be a faucet. It is revealed to be as such when Eraser uses it to fill a water bottle.

Used by...

 * Tennis Ball (possibly)
 * Eraser
 * Four (technically)

Trivia

 * The Lavatories appears to have a water fountain, as seen in Paper Towel.
 * It is unknown which door is for males and females, as both doors has a circle with rectangles in them as a symbol.
 * However, in Paper Towel, Eraser went into the one on the right, meaning that the girls one is on the left.
 * So far, only males have used the lavatories.
 * It is unknown whether the lavatories are unisex or gender-specific.