Pleiads

Pleiads is a multi-stage space shoot 'em up in which enemy ships fly at the player in waves in a similar fashion to games like Galaxian and Phoenix. Ships emerge from a mothership at the top of the screen and swoop downwards in a series of patterns which players must anticipate as they shoot the ships and avoid being obliterated by the Martian onslaught. There are four stages in the game. In the first stage the Earth space ship must defend the space station from Martian invaders who have the ability to transform from flying invaders, to walking invaders who build walls across the Earth city; these barriers must be destroyed.