In the world of Hide & Hold Out, you are one of the survivors of the cataclysm which happened near the end of the 20th century. This cataclysm has led to a brutal elevation of the sea level all around the globe. Today, you don't really know if there is still a true "land" somewhere, but you know that this reef saved you after the disaster.

Well… not only you, actually, and that's more of the problem. You will have to find by yourself something to eat, materials and fuel to stay alive, to build yourself a home and to start building boats and weapons. The other players can be a curse in H2o, but they can also be a blessing as working with other survivors will give you the key to both safety and power.