You are a fearless space commander who must rescue a fleet of eight space ships by piloting each one through a cavern, known as the devil's descent, which is 40 screens deep.
Your ship is permanently falling but you can move left and right to avoid the numerous stationary obstacles and the cavern walls, in other words avoid everything that isn't black - Henry Ford would have approved! In each direction you may move slowly or fast, if you press both keys you move very quickly, necessary if you are to negotiate the trickiest screens. However, this arrangement is very difficult to get the hand of - both in judging the correct speed and pressing the appropriate key. There is no joystick option.
When you have completed a descent you return to the start with a faster ship - or shop according to the instructions! There are also four skill levels which slightly affect the speed.
There is a demo mode, and you are given the welcome option of a training mode which allows you to practise on each screen.
Graphics are adequate, with many of the objects being repeated on different screens, but if you travel close to the edge of the cavern, the ship's green colour overwrites part of it, leaving behind a trail of green blobs.
Devil's Descent is just a dodgem game and I doubt it will appeal for long. Although it is very cheap, I would recommend saving up to buy a more interesting game.