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This is the level select screen. Which can be accessed either by clicking the pink box full of 8-track tapes on the main menu or clicking the eye icon on the pause menu (M key)

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From here on, I will be referring to worlds with numbers (1-8, for example). The first number is the column and the second number is the row.

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This world is a collection of all water-type worlds

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This world is the world from the story mode (The book in the center of the title screen.)

In world 4-8, there is a television hidden on a level underneath the main platform with the spiral stairs. Walk into the TV in order to go to a randomly selected hidden world. The worlds are generally quite similar: One door behind you, total blackness all around, and a strange singular object in the center, which expands/explodes when you get near it. Unique sounds come from these objects.

Update: These worlds are also accessible from the television on the top of the tall tower on 1-3. It is not the tower you start in, and it takes some parkour to get up there.
Update 2: There is also a television on top of a tower on 2-7.
Update 3: There is also a television on a platform underneath the far door on 3-9.

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Follow this video guide to get to this hidden world:
If you cant access the video:
1. Go to world 2-1.
2. Search for a column of light going into the sky.
3. Go into the column of light and you'll ascend into the sky.
4. Go into the door in the clouds.