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From the game's own description and controls:
Oceanar.io is a multiplayer ocean survival game where you start as a tiny fish and must eat smaller creatures to grow. As you get bigger, you can eat larger prey, but watch out - there are always bigger fish controlled by other real players hunting you!
Navigate the vast ocean, avoid predators, and climb the food chain to become the biggest fish in the sea. The .io multiplayer format means you are competing against real players from around the world in real-time, making every swim through the ocean an unpredictable adventure.