Z-89
Z-89 is the Coco 3-exclusive variant of Zaxxon, by the same author (Steve
Bjork) who developed the original, officially licensed Datasoft version. This
game was released twice (with some slight changes), once when sold by Game
Point Software, and then directly by SRB Software after Game Point folded a
short time after.
The basic play of Z-89 focuses on the objective to destroy the Zaxxon robot
at the end of the two floating space fortresses, while defending yourself from
planes, tanks, missiles, and colliding with terrain. You have to keep your
fuel topped up as well, by shooting fuel tanks. The game is played in
isometric 3D, showing you flying at an angle, where you can fly side to side
and up and down (you are always moving forward). Z-89 adds one new twist to
Zaxxon : in the space sequence (between the two floating space fortresses),
in addition to planes coming after you, you also have meteors to contend with.