As far as I understand from https://www.scirra.com/manual/75/how-events-work it's imposible to check overlapping or collision of multiple instances ("It would be very difficult to make good games if every bullet hurt every monster!") per frame or tick. So several frames will pass to handle situation when several bullets achieve goal (several goals) practically simultanuosly. I mean all bullets are instances of one object as well as goals. Is it correct or I missed something important and simultanious detection of overlaping and collision is possible yet?