before the new update to Game Salad i was able to make invisible walls so my player couldnt get out of the level. But now this does not work. Any help on how to make this work?
All actors by default do not collide with each other. You will need to add a Collide behavior to one of those actors to have it be able to collide with the other.
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I've updated the how-to to reflect the new collision updates. http://gamesalad.com/wiki/how_to_gsc_create_a_wall