How to play For their secret map, each player draws a grid of 20 x 20 sguares and numbers them as shown on the right. The alien starts in the left side ofthe grid and the commando starts in the right. Each turn, they can move two sduares up, down, sideways or diagonally and then give the computer their new positions. When they are less than 1.5 space units (i.e. sguares) apart, the commando has caught the aljen. ta: "The BBC micro u Y does not need a semi-colon. Z. I DIDNT WANT MY FRIEMD TO SEE | On the ZX81 you have to type 10 PRINT "GIVE ME A NUMBER"