Make sure to check changelogs for any new changes!
Level 273 is the 274th level of the Progressiverooms. It is a dark spot with pavement and grass stretching left and right, as well as a booth with three humanoid entities with masks of a tiger, rabbit and lamb. These being the Animal Masked. Walking away in either direction will make you loop around forever, but for each time you loop around, the entities will change.
Sometimes, one will be missing, two will be missing, all three will be missing or all three would be present. The entities do not behave in any special way, but they look at you. They cannot be attacked by a weapon.
A bus will never arrive here, and the only way to exit is to sit down beside one of them when only one of them is present. After sitting down for five minutes, once you attempt to exit out of the booth, you'll be teleported to Level 274.
Go down a ladder in Level 235.
Once there is only one of the three Animal Masked present, you can sit beside the only one for five minutes, then exit. You'll be sent to Level 274.
elliott (Proxied by Jacob Lee)