The hero of the game Underwater 2D arrived on a planet that is completely covered with water, there is essentially no land on it at all and all life is concentrated under water. You'll have to go down to the bottom and start exploring unknown life forms. It turned out that underwater life is very similar to the Earth's ocean. However, among the familiar fish and algae there are many unfamiliar inhabitants. It is necessary to catch them in order to deliver samples to Earth and thoroughly study them. For hunting, use a crossbow with an arrow tied with a rope. Point it at the selected object and shoot to capture it in Underwater 2D.
