Idle Fish is a simulation game in which players can manage a bustling fish tank. Players need to add fish, upgrade fish and manage other resources to keep their tank in thriving condition. The game presents an easy to learn yet tricky to master balance between resource allocation and fish tank management. Bonuses can be earned through achievements, as well as daily rewards, thus giving the game ample opportunity to reward its players.
Idle Fish can be played either with a keyboard or a gamepad. Players can use the mouse to move obstacles, select fish and manage resources. The arrow keys are used to navigate the tank and the spacebar is used to select fish. The game can also be paused with the Escape key.
To start playing the game, players must first create a new tank. When the tank is created, the player can start by adding fish, upgrades and resources. Each fish has its own specific needs and the player must manage their resources wisely to make sure all the fish in the tank are happy. There are various tools the player can use to manage the tank, such as the fish brush, tank heater and a fish food tray.
Once the player is able to manage the tank, they can progress through the game by adding new fish, upgrades and resources. Upgrades include adding decorations, changing the water type and increasing the tank size. Resources, such as food and money, are essential for players to manage the ecosystem of the tank. Players are rewarded for completing achievements, such as feeding the fish or completing a certain number of tasks.