Play Agar.io Unblocked game to start iO games with a really good one. So good that many iO games have been developed after it. Set nickname on main menu where skin selection is made as well. Note that skin selection is only available for registered players. Registering is so simple and one-stepped. Just click on buttons to sign in with social accounts to create a quick account. Then you may save coins for upgrading your avatar. New skins are available to be unlocked by players using saved coins. You’ll see party mode on main menu at right side. Party mode allows you to play a private game with your friends. Create a party game and save your game code. Share this code with your friends to let them in your game.