Insaniquarium Deluxe is a puzzle video game created by Flying Bear Entertainment and published by PopCap Games. It was released on September 1, 2004 for PC. Insaniquarium Deluxe features pets, various modes of gameplay, and a type of currency called "shells". Shells are collected as the game progresses, and they can be used to buy bonus pets or purchase fish featured in The Fish Emporium in Virtual Tank Mode.
Players must manage a tank of guppies and other aquatic creatures, each stage begins with two guppies in the tank or one breeder which creates guppies. Guppies and other fish drop money, which can be collected by the player and used to purchase fish food and upgrades, such as more fish, better fish food, and more powerful lasers to repel alien attackers. Each fish must be kept alive by feeding, whether through fish food bought by the player or through the consumption of other fish in the tank. In addition to feeding fish, the player must protect the fish from aliens that periodically enter the tank and attempt to eat the fish. The aliens must be clicked on repeatedly with the mouse pointer in order to defeat them.