Feeble version of the well-worn arcade game. No colour, of course, but on a machine with user-defined graphics the invaders ought not to be just white squares and oblongs or the defender's gun merely a small square.

The bombs fall so slowly and jerkily the program might as well be in Basic and there is no synchronisation between the gunfire and the destruction of the invaders.

If it were not for the increasing but meaningless score in the bottom left hand corner you'd hardly known they'd been zapped. They present so little threat to the player that most people will end up feeling sorry for them!

The program was very difficult to load and came along with three others from the same supplier which totally resisted all attempts. The Ace would put up the dictionary notice but firmly refused to say "OK" - maybe the smart machine was trying to complain about the misuse of its potential.

G.M.