You are a N.O.M.A.D. (a Nemesis Organisation Mobile Attack Droid) and you are armed with two magnum 57 calibre blasters, protected by a titanium body shell and powered by anti-gravity pods and twin thrusters. You're also untested but you only have to kill one man. Unfortunately, he is Cyrus T. Gross who is the head of the Intergalactic Criminal network and lives in his own heavily guarded city.
To get him you will have to fight your way through a series of heavily guarded passageways.
You will have to either avoid or take out gun emplacements set in the walls, deadly magnetrons that lurk in corridors, suicidal robothugs that hurl themselves at you and avoid magnetic walls that can slow you down and even drag you into the path of the guns.
It takes a while to learn how to control the N.O.M.A.D. as it seems to have more than its fair share of inertia and it takes some effort to get it moving but then the danger is that you will then fly off, totally out of control, straight into the range of a gun emplacement.
However, you're soon over this stage and stalking guns to seek revenge for countless N.O.M.A.D.s that have gone before.
This is definitely a game that you will play again and again.