This cartridge game is a worthy successor to Parsec which is regarded by many Texas owners as a classic. The screen is a view through the window of the USS Recovery, moving through a mine shaft on the moon. Beneath the screen are the status gauges, showing the temperature of the lasers, the water level, and number of crew members remaining.

The level of play - there are 60 levels - together with current and high score is also shown.

Red cones on four sides of the screen represent lasers. The vertical lasers have limited mobility and unlimited range and conversely the horizontal ones have unlimited mobility and limited range.

Since the lasers are water cooled, it is necessary to replenish the supply which is done by ejecting a crew member into the mine shaft. While he is out there he only has twelve shots against monsters.

The placement of the crew is achieved by pressing the space bar, as is the removal. There are also opportunities to retrieve stolen treasures back from the Zygonaut, using the space bar and fire button.

If you are fortunate enough to have a speech module, this works in both English and Spanish. When you hear "Monstro ha destruido buque", you know you're in trouble!