HelmetRoyale.io, a cool game that combines battle royale action with retro 2D graphics, is an amazing one. You start with a defense helmet that your character wears. As you play, you can swap it out for stronger helmets made of different materials.HelmetRoyale.io, a cool game that combines battle royale action with retro 2D graphics, is an amazing one. You start with a defense helmet that your character wears. As you play, you can swap it out for more durable helmets made of different materials.