

The money you gain from diving can be used to purchase fish, decorations, and equipment (filter for the tank, fish vitamins, etc.). When all of the items are found, the player is rewarded with various amounts of money based on the speed of the items found and how many hints were used. The items the player must find are taken off of a list given to the player by Grandpa Jack. The game then has you dive for hidden treasure in various levels.

Her grandpa, called Grandpa Jack throughout the game, says that she should create fish tanks with unique fish and decorations over her summer break in order to impress her boss, Old Barny. The game has the player go through the game as Jennifer (Jennie), an intern at a marine biology institute.

The game was originally released for Microsoft Windows and Macintosh computers, but was later released for the Nintendo 3DS on Jin North America. Fishdom H2O: Hidden Odyssey is a hidden treasure hunting game released on Apby Russian studio Playrix.
