It was difficult; but the graphics were mesmerising for Sinclair Spectrum. As missiles were stopped, the "aliens" got weirder & more colourful,, wapring their way around the screen. I first played Jetpac after this, which seemed such a deadend game in comparison to the endless tracks of Lunar. Side missions included laying track across the entire landscape, and trying to find the (non existent) trailer, which could have been so useful.
