Contrary to expectation, there have been very few implementations of the popular arcade game 'Defender' for the Spectrum. This has had little to do with the actual marktabililty of the game, as can be seen from the quality of sales made on those available. This lack of competition has been to the disadvantage of the games player.
Till now, with the introduction of the Invasion Of The Body Snatchers, from Crystal, which is a full implementation of the arcade game, includes a full radar, Hall of Fame, etc. Obviously, few points can be awarded for originality, but on the other hand it is the quality of the implementation which puts it so far above the rest. The explosions, especially those of yourself are graphically fantastic - see the original. Movement of yourself, the enemy and the bodies is not just smooth, but *very* smooth and fast. Very fast.
As more and more aliens materialize on the screen, the whole game gets frantic indeed. All the normal functions are available - forward, reverse, fire and smart bombs. Firing is not auto-repetitive which makes the game more difficult still. Scoring is on-screen, with bonuses added for the number of bodies left after each wave of attackers. If, of course, you manage to score one of the top scores you can enter your name (or message) on the Hall of Fame.
Sound on the Spectrum could hardly do justice to such an impressive program, so Crystal have opted to support the Fuller Music Box only. This is rather awkward for those who do not own one, but another sacrifice which would have to be made when using the Spectrum's own sound is that of speed. The Spectrum does not allow you to send a sound to the noise circuitry and let it get on with the production whilst you get on with the rest of the program - the Fuller Box does, hence allowing the game to run faster. Not surprisingly, the sound effects produced are very good, a credit to both Crystal and Fuller.
As often is the case, life is made a great deal easier with the use of a joystick, and this game is no exception. Fast and precise actions are the name of the game, a very enjoyable and addictive game. Highly recommended.