Blasteroids (UK) (1989) - Amstrad CPC - Arcade

As the name suggests, this arcade conversion updates the basic Asteroids gameplay. That means to say that the main gameplay consists of flying through single-screen wrap-around levels shooting at rocks, which split into smaller rocks when hit, eventually becoming small enough to disappear. In this case the Asteroids are protecting Mukor, an evil being who is poisoning planets under the Colonising Corps control.