Moving from one extreme to the other, Crystal Mission (also by Mr. Stroiczek) is really twiffick! Unlike The Space Duel, Crystal Mission is a one-player game, and one in which you must manoeuvre a spherical droid around a variety of screens collecting a number of crystals. Once collected, the door at the bottom of the screen with open, allowing you to get to the next level.
Ho ho ho! It's the usual case of 'Sounds pretty easy to me' syndrome. As per usual, there are a smattering of aliens to contend with and not to mention mines scattered about the screens to catch out those with slow reflexes. This is made just ever-so-slightly more difficult by the fact that your droid moves as if he's on ice. If you let it get out of control, you'll be bouncing around the screen until you eventually meet with a deadly object.
The types of alien are varied, from simple drones that wander around minding their own business to these annoying cross-shaped gets that have an amazing knack of barricading you in with electric fences.
Fortunately, you are not unarmed. You, have an infinite number of bullets that can be shot in eight directions and five smart bombs that kill every nasty on the screen. It is worth noting however that shooting or bombing an alien does not kill it. It simply returns to its starting position and waits a few seconds before starting off again.
There are a total of 30 levels, starting off with a couple of easy starter stages and gradually getting to the point of anarchy. The only flaw is the lack of a password system. Having to go through each level again when you die can get quite tedious. Just a small glitch, nothing to really get stressed about - Quality with a capital Q, U, A, L, I, T and Y.