This is one of a growing number of games which offers you remarkable value for money. Your task is to move a manned space-capsule down through a pyramid, which has fifteen different levels.
At each level you come under attack from a different type of alien - so it's fifteen games in one.
Actually, it's more than that. The authors have arranged that each time you descend a level you have a choice of two rooms to enter, each containing a different species of nasty.
So you can come across different creatures every time you play - up to a total of 60 types. Quite enough to maintain your interest for a month or two. Or six.
The game works like this: in each chamber you shoot up as many aliens as you can. When you've zapped a certain number, a crystal appears which you have to collect, and drop through a force-field.
After you've done this a few times, the force-field is neutralised and you can pass through it into the next level. The faster you manage to complete a room the more points you get.
The game plays very well. It features smooth graphics and all the aliens are nicely animated. For example, the first wave consists of dustbins with banging lids.
Fantasy Software have tried to add to the game's attraction by including a numerical puzzle to be solved. At each level you may be given a number.
If you put these clues together you're supposed to be able to work out what number is at the bottom level and hence discover the Meaning of Life.
Fantasy have also built codes into the program to enable them to verify high-score claims. Every six months they plan to publish a list of the top thousand highest scores.
So it all adds up to a game you could spend a great deal of time playing. I thoroughly recommend it.