You bought a cheap return ticket to the moon aboard the MASA shuttle service. When you got there, you started nosing around in the underground caverns of the lunar world and got thoroughly lost. You must now find the space shuttle so that you can return home again.
Notes
This was published as a type-in game in Creating adventure programs on the ZX Spectrum by Peter Shaw and James Mortleman, pp. 67-73, and in Creating Adventures on Your BBC Micro by Peter Shaw and Stuart McCrae, pp. 80-88.
The BBC Micro version has a different map and solution to that of the Spectrum.