Gargoyle Games' Marsport was reputed to be at least twice the size of the company's two previous releases, Tir Na Nog and Dun Darach. Unlike its predecessors, which were played on a flat plain, Marsport is constructed like a 3-D tower block and features one or two neat 3-D effects.
The scenario transports you far into the future. The safety of Earth is threatened by an alien race known as the Septs. Unless Commander John Marsh manages to locate vital defence plans hidden deep within the opposition stronghold, Marsport, the Earth will be overrun by the aliens.
The enemy infested passages yield a series of useful objects which can be disposed of in rubbish shoots (you can't drop anything) or stored in lockers (though first you need to find a key). Restricted areas can only be accessed once you've located the central computer.
Though the 3-D effects which distinguished Marsport in its time are fairly standard now, the gameplay is still just as gripping and absorbing as when it was first released. You may not be stunned by the graphics but the intricacy of the puzzles and the sheer size of the adventure environment means that Marsport still presents a complex and compelling challenge.