Let us also fondly recall some other vector graphics video games: Battlezone, Space War, Ripoff, and a favorite of mine, Star Castle, which featured a clear colored sticker on the screen to give the appearance of color! Actually, now that I think about it, didn't Space Invaders have a colored sticker on the screen too? There was a home system for vector graphic games called Vectrex--old ones are still findable for not very much money.