Skeleton Key

Skeleton Key is a special key that can be obtained for 10 robux. When it gets put into a lock, it will instantly turn and unlock the door, but it will not increase your unlock count by 1. Badges also say that the Skeleton Key doesn't work on the badges, because the skeleton key will not increase your unlock count by 1.

If you look behind the purple pipe where the Keys spawn at the start of the game, there is a sign that says "eg lol" and when clicking on it you will be offered to buy "Jade's Memes" for 15 robux, if clicked yes (assuming you have the robux) it will summon a Meme Key, which is basically a remodeled Skeleton Key. There are many different Meme Key styles that can spawn from it.