Aquarius: An Aquatic Experience is a free, open-source arcade game created with fan-customizable tools for developing new games using the venerable SCI engine that was used for many years in several classic Sierra titles. In this simple, short game, the player guides a swimming goldfish with the mouse, carefully moving it through the restricted space of an aquarium to avoid all environmental hazards and survive a week (with the cycle of the day occurring every half minute or so).
The energy available for movement and survival is shown as a green bar at the bottom, which slowly depletes when the creature is in motion, when exposed to the bright lights at the top for too long, or when placed too close to the heater on the left side. The fish is cured when it is motionless and resting under shadows and out of harm's way. A line with a hook keeps moving back and forth, catching the fish automatically when touched. A small purple fish keeps coming out of the decorative castle model at random intervals, and is able to swallow the larger goldfish after touching it.