In 60 levels you have to rescue as many passengers (dubbed the Dim Passengers) as possible. At the beginning the passengers fall through a tube in the level. Similar to Lemmings you have to find a way for the passengers to the exit of the level. In order to do so, you must blast hindrances such as cargo boxes and bulkheads with bombs or, when no bombs are left, reposition the boxes with a crane. There are also conveyor belts in the levels. If the belt moves in the wrong way, the passengers either can't use it or may even be transported to their dooms, being dropped off into water, fire or steam jets. You can usually choose the direction of the belts by pulling a lever.