Deeeep.io is an interesting and exciting multiplayer game, which is still in Beta version. The main task is to develop your character, grow and evolve better and faster than your competitors.
To achieve this, you have to collect food and receive points in order to upgrade to the next level. At the start, you have to select an appropriate biome that later has a chance to develop. There are different types of these animals, and each of them has different requirements in order to grow and evolve.
They also have different abilities, so you may find out they are not all suitable for your needs. Some might need oxygen to live and develop, others might require salt water and so on. You have to find those details for yourself when you start playing this game.