The coins will disappear if they reach the bottom of the tank. Guppies and other fish drop coins, which can be collected by the player and used to purchase fish food and upgrades, such as more aquatic creatures, food that can keep the fish full for a longer period of time, and laser upgrades to repel attackers.

In the game, the player must manage a tank of guppies and other aquatic creatures, and each stage begins with two guppies in the tank.

Insaniquarium is a virtual pets simulator with a blend of elements from action, strategy, and puzzle video games. Screenshot of gameplay from Insaniquarium Shells are collected as the game progresses, and they can be used to create a custom Insaniquarium screen saver, to buy bonus pets or to increase the number of pets allowed in each tank. Insaniquarium Deluxe features enhanced graphics, new pets, new modes of gameplay, and a new type of currency called 'shells'.