JohnPapiomitis said: make a actor, uncheck moveable under its physics attributes, and put a collide behaviror with whatever you dont want to pass threw
make sure to put the collide behavior in the player's actor
Put the collide behaviors in both actors' rules. Also, under the GRAPHICS attribute in your wall, uncheck Visible. That way, the player won't see a giant, impenetrable wall; only that the character can't move past the invisible wall.
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(@johnpapiomitis - thanks for your help earlier with the one pixel scene issue)