As sole defender of a group of cities you have to fight off deadly missiles using the almost inevitable laser base. You have four cities to defend and three bases from which you can fire. Sadly there are only ten rockets available in each base. When your supply is exhausted, the enemy continues to attack ruthlessly until your planet lies in ruin.
After you've seen off each wave of enemy missiles your supply of rockets is replenished. Provided you have managed to save at least one city from the preceding screen, away you go again.
Extra cities are awarded for every 1,500 points, and other features include a two player option - very welcome when your friends play for hours - and a hi-score facility.
All in all I was impressed with City Defence. The instructions were concise yet clear and appear on screen as well as on the inlay card. The sound was good and did not become annoying as often happens. Indeed the sound produced by an attacking wave of missiles was really quite tuneful, although it could not be turned off if it did become tedious. The use of graphics was fair, if not exactly startling.
Perhaps a hardened arcade fanatic might be a little disappointed at the absence of one or two features present on the original - for example there are no spaceships appearing from time to time. Having said that, to most people this game will provide a good deal of entertainment and is great fun to play.