Fishdom H2O is a game where players get to manage their own virtual aquarium. The game has two game modes – Relaxed Mode and Timed Mode. In Relaxed Mode, players get to play the game at their own pace. In Time Mode, players must race against the clock to meet game objectives. At the start of the game, the fish tank is empty and player must fill them up with sea creatures and items. There are three categories at the bottom of the screen. These are fish, beauty, and comfort. Clicking on these categories displays the available items for purchase. The fish tank’s rating can be seen at the upper right portion of the window.
Players can get more money for purchasing fish tank items by clicking on the “Dive” button. This brings up a hidden object game set at the bottom of the sea. Players must find all the items listed on the game window in order to get more money. Users can also use hints to find items on the scene. Each of the three categories (fish, beauty, and comfort) must have full bars in order for the player to get a trophy. The game features more than a thousand items to find in the hidden object game. There are also three aquarium themes to decorate.