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Level 40 is a small room with de-saturated lime walls and a pale white carpet floor. A classic television and a blue bike can be found here, and the bike can be taken off from this level and can be used as a good way to move. Some black-and-white posters of 1960s movies are hanging on the sides of these walls, along with a single light bar. A trapdoor can be found here and cannot be opened without a key from a specific level.
Turning on the TV, which is oddly still functional and changing the channel to Channel #2 will simultaneously teleport you to Level 138.
If you decide not to attempt to open the trapdoor, then you may find a door that is slightly ajar. Going through the door will lead to Level 41.
There are no known colonies and outposts found in Level 40.
A ladder found in Level 39 may lead here.
The trapdoor will lead to The Bismuth Caverns upon unlocking.
A slightly ajar door leading to Level 41.
Turn on the TV and change the channel to Channel #2 to enter Level 138.
Changing it to an ominous Channel #@ will allow entrance to Level 142 instead.
Jacob Lee