Level 0 doesn't actually take you to the Frontrooms, it takes you to either Level 1 or Level -1
You can just find a fire exit. If the backroom is real, then so is Level 0. You can get out there and there is no other levels. Just find an exit sign
@M3Builder18 it's such a small chance that it's barely plausible, but if you can find that, you've ran out of luck man.
What do you think?