A close copy of the arcade game Galaxians. The aliens swoop down in small groups, first bombing your ship, then attempting to ram it.
Bonus points are awarded for shooting down the command ships, and an extra base is received at 7,000 points. This copy even has the galaxians that 'loop the loop' at the bottom of the screen.
An option for two players is included, and an option to start at a, higher level. The sound effects are sufficient for this type of zapit-if-it-moves game, and the invaders themselves are very colourful.
Having seen the cartridge Galaxians now available, I would still choose this very cheap but very good copy.