I have an idea of how I want to spawn obstacles for my endless runner game; what I want to do is spawn them randomly on the right and move them towards the left hand side of the screen. And once they are out of bounds of the screen, I want to kill them. But I need some help figuring out how to write the function that would do this. So far I've made a title screen, and the basic "treadmill" structure of the endless runner with player movement.   var game = new Phaser.Game(820, 360, Phase