Superhero.io is a cool free online battle royale IO game in which you can play as one of your favorite superheros. If you enjoy multiplayer online IO games about becoming more and more powerful, and you are a fan of comics, you are going to love this one. Start fighting as Captain America, and others, like Iron Man, The Hulk, Wolverine, Batman and many, many others. Use your large weapon to attack your enemies and become the leader of the match. Have fun with Superhero IO!