In the shops, this program may be called 3D Space Wars or War Of The Worlds, as all three titles were on the review copy. But 3D Seiddab Attack looks like the latest version.
The 3D does not mean you have to wear those uncomfortable specs supplied with some "three dimensional" games. You command a drone, something like a tank, which has to shoot down waves of advancing ships. They are small to begin with (in the distance) and larger as they get closer. The effect is quite reasonable and it means the aliens are hardest to hit when they can cause you least damage.
They also move from side to side, but so can your turret, and the whole drone can be steered around the city following a small maze-like map in the display.
Graphics are some of the best I've seen in this kind of game for the Spectrum and movement of gunsight and ships is quite convincing. The overall effect is a little like the 3D tank battles so popular in arcades in far off days, and very playable it is too.
I found the keyboard controls a little difficult to handle and the instructions could be improved. However, there is an option for Kempston-style joysticks and these are needed to fully enjoy the game.