Hello, I'm writing a simple game in Python with Livewires. I have a couple of sprites in my game, but I want them to be solid so that my character doesn't run over them, but is stopped when he runs into them and so that the flying sprites rebound of it as they do against a wall. I have a 'Phantom' as the main character and a Piano as the other sprite. I think I have to use (in Piano class): for Phantom in self.overlapping_sprites: .... something, I'm not sure. Any help would be appreciated. Thanks. Adam Moss