Tempest

Tempest is a shooter where your craft moves up or down the left side of the screen while a variety of aliens moves from the right side towards you. The aim is to avoid or shoot the waves of aliens called sectors which can last from 23 to 40 seconds. If you are touched by an alien or it's lasers then you lose one of five lives. Once you have survived a sector then you move towards the right of the screen attempting to avoid the spikes to move onto the next. There are variety of aliens that move in different ways with some firing back at you and others indestructible. There are five skill levels (1-5) with 1 being the hardest and the easier the skill level the longer a sector lasts. A joystick or keyboard is used to control your craft.