self._roaches = self.actors.add_layer("roaches", level=10)
self._pads = self.actors.add_layer("pads", level=5)
self._buttons = self.actors.add_layer("buttons", level=6)
self._roaches = self.actors.add_layer("roaches", level=10)
self._pads = self.actors.add_layer("pads", level=5)
self._buttons = self.actors.add_layer("buttons", level=6)