Agar.io is a completely original game. Many games have been developed after agar.io but none of them could give the players more fun than the original game. You will begin as a small ball and you need to devour other ball that are around to grow. You can also consume others players but you will need to grow a little to start doing that. As the saying goes, the big fish eat the little fish, this game cant be explained better than this. You also use Space key to split yourself and gain temporary speed to consume other players. Use your mouse to move around. Show direction and you are ready to play. Get your friends to play with you at the same time. Because this game is a multiplayer game that you can play with your friends at the same time. You will have lots of fun times with agar.io.