Aliens is the first machine code game written for the Mattel Aquarius computer which is a shoot'em down game with a difference, you man your laser guns and squadrons of coloured aliens attack you. After you have shot down 25 of them you move into a different type and . . . you've guessed another type and another coloured alien appears. You actually get 16 different levels, styles and coloured of aliens, this addictive game will keep you occupied for hours.