A faithful rendering of the arcade favourite where missiles track and branch down the screen. They're after your cities and your missile launchers. You have three bases perched on mountains left, right and centre, plus six cities to protect. You aim missiles by placing the cursor in the path of one or more enemy missiles and selecting the appropriate fire base using f0, f1 or f2 (or if you press SHIFT the program selects for you the nearest base to the target). The cursor is moved using the arrow keys; A and Z can optionally be used for up and down.
As you can gather, some degree of manual dexterity is called for, but if you have a joystick, select J and life's a lot simpler.
At the end of each raid, the surviving cities and remaining missiles are totted up. On wave two, planes and satellites fly by dropping more missiles in their wake; on wave six, smart missiles that dodge your missiles make an appearance. The game ends when all six cities have been knocked out, and you'll have to endure a nasty stroboscopic 'the end' display that seems to last for hours. Get on the scoreboard and you're treated to a famous Cliff Richard tune (not Summer Holiday!). Up to four players can play together in turn. A must for arcade action freaks, it's also available for the Electron.