Your mission is to rescue two teams of seven desperate men, trapped underground on level five. You must bring each man to the surface, surviving the dangers you meet en route. You could, if you're lucky, survive the rock falls by perhaps jumping over them or leaping through a trap door to another level. So... if you're fit and you can run like blazes you can get to the surface. But, how do you stay alive when waves of gas are cascading down the shafts? Well... we can't tell you everything.