CITY DEFENCE Defend your city and its nine laser bases at the bottom of the screen from the falling meteors. If you touch a meteor with your sights your lasers will fire and destroy it. Move up with Q, down with Z, right with P, and left with I. Move diagonally with the appropriate combinations of keys. You can also move through the three zones of the airspace very quickly by pressing 1, 2 or 3 as appropriate. The game becomes progressively more difficult and one meteor can destroy your entire city. Tim Wolverson of Rotherham, South Yorkshire, who wrote City Defence for the 16K Spectrum, says his highest score so far is 3,360.