The aim of each level is to find the exit, which will take you onto the next level. The exit to each level is like a square flashing vortex which you simply walk into.
You can move around the maze using the keys, and shoot the green aliens by using the fire button, causing you to shoot in the direction you are currently facing. You only have limited ammo, so you must walk into the coloured squares marked "G" to gain more shots. They are quite common.
You also only have a limited number of shields, which can be depleted by walking into or being shot by one of the aliens. This too can be replenshed by walking into the coloured squares marked "S". Both your number of shots and shield level is shown at the top of the screen, along with your score.
The cyan coloured squares on the map are doors, and the aliens cannot walk through these. The map also wraps around, so you can end up going in circles, and it seems a lot bigger than it actually is.
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