ALIENS ------ Can you defend the Earth from the invading aliens in this game written for us by Andrew Cole of Burnley? In this game for your 16K Spectrum, you command a missile base which you can manouevre along the surface of the Earth, using the 'p' key to move right and the 'o' key to move left. To fire a missile you have to press the 'q' key. The aliens, in their usual unfriendly way, re-energise at different levels above the Earth, one at a time. It is your job to shoot them out of the sky before they get enough ships out of hyperspace to destroy the Earth. Once they have 10 ships positioned over the surface, they will be in a position to do this. So, your mission, should you choose to accept it, is to keep down the number of aliens in the sky to less than 10. You can only fire one missile at a time on-screen, but if you find it too difficult to play at one level, you can always choose another - there are five skill levels in all.