QIX was one of the very first arcade games, debuting in 1981. The goal of the game is to take as much land as possible without getting killed by the enemies that might come in contact with you. You cover a territory by filling rectangles on the screen, and when you've covered enough area, you can proceed to the next level and start again on a new territory.
On each level you must cover 65% of the total territory in order to reach the next level. But the more you cover above the required limit, the better bonus points you will get. When you cover territory you can do this in two different speeds - fast or slow. The slow method is trickier as you will become more vulnerable, but on the other hand the slow method will give you double points for each territory covered.
Your enemies are the spinning "Qix" which moves around inside the territory; the traveling "Sparx" which move along the borders of the territory; and the "Fuse" which will track you down if you hesitate. There is also a timer running, and if time runs out, you will get a new timer so the game goes on, but there will also be two extra Sparx chasing you down, and if you let time run out again, the four Sparx will become faster and faster.