Oceanar.io is a battle of fish swarms game. You are starting to play as the leader of fish which has a lamp to illuminate the darkness of the ocean. Players will have bigger swarm when players’ the leader of piranha eat plankton, debris and small jellyfish. In addition, crabs are special units for your herd because of their strength. If you kill the enemy’s main fish, you can capture his fish swarm that is easy way to grow your swarm. Once you enough fish, you should do two things which are to turn small fish into bigger fish by right click mouse and to attack enemies by left click mouse. The leaderboard shows top ten players who have bigger score compared to other players. You can see your rank and score in the bottom left screen. You should try that game if you like agar.io and piranh.io because this game looks like a combination of them.