People loved the recent update Valve brought to Portal 2.
Well, next year you will be able to create your own levels thanks to a future update which will add an in-game editor to Portal!
Valve says the editor will allow users to create both single and co-op stages, and will be “easy to use,” which suggests an interface much simpler than what is usually used to build levels for games.And here's some early screens of said editor:
Players will also apparently be able to “view, play and vote on them [levels] with a simple click.”
Looks pretty simple and straightforward. I love it already!