Fish3D.io is an underwater game of survival in which players navigate a tiny fish that tries to recreate life in a desolate water ecosystem. With features such as multiplayer and regular updates, the game presents a dynamic environment for players to face various obstacles as they gather resources and build up their watery world.

Fish3D.io places users in an environment that seems to be devoid of life but has the capacity for living beings. The objective of the game is to assist in repopulating your miniature aquatic environment by harvesting raw materials and surviving the harsh conditions.
Multiplayer gameplay options are available for users to come across other fish that are under the control of actual people. While some might choose to stay away from you, others will seek you out for confrontation. There are frequent upgrades and additions to the game, such as voice chat capabilities among players.
The first thing you need to do is find food sources to survive. There is grass all over the map, and it will help in regaining your energy level. Your fish will be weak without any food, and you will be easily defeated by other players.
It is also important that you defend yourself from attacks. This requires you to be cautious and avoid attacking players. However, you have the option to fight whenever you want.
Z: Swim.
X: Swim faster.
CTRL: Action or attack.
Left side touch: Turn left.
Right side touch: Turn right.
Right side screen: Move camera.
ESC: Show cursor.
ENTER: Close notification.
Start playing Fish3D.io now and see if you can survive and rebuild your underwater world.