Terraguard

_Terraguard_ is a fixed screen shoot ’em up similar to Moon Cresta and
Phoenix. The player controls his ship down the base line and has to shoot at
the aliens above him. There are three aliens for each stage and the player has
to shoot them all down to move on to the next stage. At the same time the
aliens have a ship that tries to land on the surface. To stop it from doing
this the player has to be quick in destroying the aliens. Else the player will
be killed by the ship’s tractor beam. The player has three lives and earns a
new one when scoring 1000 points. There are three different kinds of aliens:
jeeby-jeebys, eyes and mouths. Each alien gives a different score depending on
how hard they are to take down.