Finding the earliest example of a cooperative video game has long been a quest of mine.  In this column, we've covered some of the oldest and most important co-op games.  Mario Bros., from 1982, features co-op exactly as we define it here at Co-Optimus. Joust had a form of co-op, too, and it was released a few months before Mario Bros.  Today, we look at an even earlier classic game with cooperative elements: Space Invaders II.