In BB2.0 you could easily set a "cooldown" for a scene. As such option doesnt seem to exist in BB3.0 (dont know why), how can you make sure that scenes wont repeat during a level? With cooldown you could just set high enough number, which would result in the secene not repeating. The good thing about cooldown was that you could also have a small cooldown number, if you wanted that scene having a chance of repeating in a level. In a nutshell -How can you make scenes not to repeat if your running scenes in random order.