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Unlockable Dictionary is first seen as a hallway with other hallways connecting to it along with balloons, yellow walls, blue walls and doors. The hallway gets longer per every level you visit, making it like a collection of them. Each room will feature a level that you have explored before. It will feature a compressed and smaller version of the level in a room. However, this doesn't apply to Esoteric Levels nor other Non-Level Spaces.
Once you find Unlockable Dictionary for the first time, if you have visited more than 50 levels without using Unlockable Dictionary to get to desired connections and unlocked them, then you will be given a teleportation remote that will allow you to enter this NLS anytime.
A monochrome door found in Rio's Nexus.
If you unlock more than 50 levels without using Unlockable Dictionary to find them, then you are given a remote where you can teleport to the Non-Level Space anytime at ease.
Go out the door you came from to get back to Rio's Nexus