Vanguard is an early shooter, and to me it doesn't have the replay that
other shooters have, such as my more favorite games like Defender, Asteroids,
or even the original Space Invaders. Certainly its an obscure game that you
won't find on many home consoles (the 2600 had a version too). You control
a ship that fires in 4 directions, and you fly through scrolling tunnels
defeating an assortment of enemies. Defeating enemies is a must since you
gain fuel by toasting opponents.