I played a PC shareware version from 1985.
Well, considering that the computer will pretty much instantly kill itself trying to go through the planet/star (if you choose to have a planet/star) to attack you, since that's the shortest distance to you, it's not real hard to beat it. Still, it's a great two-player game. Don't choose to add the planet/star, or add gravity, and it's a pretty decent one-player game. For a game that's over 50 years old, it's quite impressive and still fun to this day.
