Clear all dangerous creatures from each depth level and collect the treasures. When creatures are removed, collect the treasure. Creatures automatically attack other creatures that are one step below them in the food chain. the food chain is shown beneath the game.

Use the Cursor keys to maneuevre. Space bar- To fire. To change depth levels move into the center of the trench, away from the walls. Your display will show when it is safe to go up or down. Press "A" to move up depth levels. Press "Z" to move down depth levels.