Based on the original coin-op game from Taito, you play the part of agent Otto, trying to recover some secret papers. These are hidden somewhere within a multi-storey building and you must find them all before making your escape.
The game starts with you being landed by helicopter on the roof of the building. The papers are hidden in rooms cunningly marked by flashing doors (some secret!) and you move between floors by waiting for and catching one of several elevators or, as we would call them, lifts.
Henchmen patrol the various floors, shooting bullets at you, although these move so slowly you can leap over them if you don't particularly feel like getting shot. You can, of course, fight back, either by using a gun or karate kicks, and you get extra points for doing it in the dark - you can shoot out the lights to throw everything into temporary confusion.
That's about all there is to the game. Get all the plans and make your way to the basement where a car whisks you off to the next level. Gameplay and graphics are both uninspiring, you would do much better to look out for Mission Elevator instead - it is infinitely more playable. Don't waste your money on this.