How to Get Deep Backrooms Keys in Pet Sim 99

Deep Backrooms Keys were added in update 11 and are necessary to open the locked door leading to the "Deep Backrooms," which is deeper than the regular backrooms.

To enter the Deep Backrooms, go to the regular Backrooms area and pay the price to open the locked door that says "Go Deeper."

Best Ways to Get Deep Backroom Keys

The fastest way to obtain a key is to purchase the Backrooms Pack for Robux in the exclusive store.

Also, these keys aren't tradable, so you'll have to buy or grind for them.

If you aren't P2W, the best method is to grind the huge boss chests that can be found once you go deeper. There is a slight chance they can drop a key, so make sure you have buffs active.

If the huge boss chests are too hard for you, grinding the regular rooms is the only way.

Another method is to beat the Secret Boss, a crab-chest monster you can randomly encounter. It has an estimated 3% chance of dropping a Deep Backrooms key.

Using Deep Backroom Keys

Once you've obtained a key, you can unlock the random locked doors that spawn around the Backrooms.

The rooms contain random things like chests and various multiplier eggs (25x, 50x, 100x, etc.) with a higher chance of hatching different backroom pets.

Each door opened costs one key, some of which will go to waste.