You can get a demo version or a full version.
The forum is pretty quite at the moment but they shared a lot custom level. Not sure if you can play them with the demo.
Here a trailer: https://www.youtube.com/watch?v=-A_JfkzPwww
https://play.google.com/store/apps/deta ... dofgoodemo
http://worldofgoo.com/
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