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I have an actor climbing up a wall. I do this by making it so that it'll move toward the wall when I press and hold a key, and will ignore gravity while the key is pressed. how do I make it so that the actor, once it reaches the top of the wall, will move on top of it? The wall is tiled by the way.

You could put a filled region at the top of the wall and then add a collision event for your actor that makes him get on top of the wall when he hits the region