In Deeeep.io, you start as a small fish and must survive and evolve in the ocean ecosystem. The game features various animals, each with unique abilities and characteristics. To play, use the WASD keys to move and the mouse to navigate. Avoid larger animals and obstacles while collecting food to grow. Each animal has different requirements for survival and evolution. For example, some need to stay in water, while others can survive on land for a limited time. As you progress, you can evolve into different creatures by collecting points. Each evolution offers new abilities, such as enhanced speed, the ability to hide, or even the ability to fly. Be cautious of predators and be strategic about your evolution choices to survive and thrive in the ocean environment. The game is endless, with the goal being to survive as long as possible and reach the top of the food chain.