How did they make this stick to wall?

[astra_wr (astra)]

You should check out this useful resource by EgoMoose:

Wall stick/Gravity Controller

Hello again! This is now my third post regarding gravity controllers. I’ve been playing around with them on and off over the past two years. I’ve learned a lot and as a result have gone through a number of iterations that vastly improve the techniques used. Now what I’m posting today is actually two separate controllers. They both have different use cases so please do read the whole post before deciding which one you’d like to use in your game or play with, etc. Okay, so on with the show! …