How to get featured
http://steamproxy.net/app/238460/discussions/10/540741858990669623/
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Where are the gems in the editor?
Strawberries are the gems of the level editor
and the pies are the yarn.
(note: always double check if you have a pie in every level before you upload it
because if you forget a pie, people wont be able to get an A++ in you level.)
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Color coding
This is very important if you're trying to get featured, it will make people like me and
the behemoth take you levels a lot more seriously at first glance.
Examples of color coding.
____________Without color coding_______________________With color coding___________
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Secret levels
The secret level is the 15th level in your playlist. You can make it adventure or challenge, just make sure to put down the secret level block in one of your other 14 levels so you can access it.
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Renaming playlists and levels
The only way to do this is make a new level name it what you want then load the level you want to rename and save it over your new level, for playlists you just have to make a new one a then save all your levels into it.
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How to test your un-uploaded playlist
Go to "local game", then go to "the arena" pick "vs" or "co-op" then go to "community theater"
and finally go to "playlists i created". if you want to test online with a friend go to "online play"
"host player match" etc.
(Note: When testing, make sure you can get an A++ every level without dying,
So that you know its possible for others.)

Teleporters
If you have more then two active teleporters the exit point will be random, But there are ways to have more then two teleporters in a level, and having only two active at a time. When you have a teleporter blocked you can't exit though that teleporter. Here is a picture of every block that can block teleporters.
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Signs
You might think signs are pretty useless and are only there to make things look nice.
Well you're wrong, There are a few things that can't pass though signs and they are
"light bridges" "random moving blocks" and "lasers" This is very useful,
and what makes this so awesome is you can use the green duck shark sign which is invisible,
There's a bunch of different ways to use signs, Here are some examples.
(Note: the fliper block has the same properties as signs.)
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Saws
You undoubtingly know how to use a saw, But there are ways to make them quieter,
and to make them stationary, Here are some examples.
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You should experiment with all of these block combinations so you can figure out what works best.

TheBehemoth's level designer's blog
blog part 1:
http://blog.thebehemoth.com/2013/10/01/bbt-development-level-design-part-1/
blog part 2:
http://blog.thebehemoth.com/2013/10/03/bbt-development-level-design-part-2/

TheBehemoth's level editor video
https://www.youtube.com/watch?v=s2ttfg9Z_Gw