I am making a 2D Platformer in BB 3.1.3. In BB2, it was called Game Frame. Your character could not pass the yellow bar, go through the gray bar, and be destroyed by the red bar. Where is that in BB3, in a 2D world? My character runs left and right on the X axis. The problem I am having, I want to limit him going back, especially once the Delete Scene Threshold has hit it's limit. I have tried the Position Limiter, it is not the answer. Once it is set, my character can go far right on the X axis, past the Delete Scene Threshold, turn back left and then stop at the original Position Limiter, all the while the background and platforms have disappeared because of the Deleted Scene Threshold.