Piranh.io Online is an Agar.io game with fish, specifically hungry piranhas. Create one, name it and chase other smaller fish and people to get bigger. The biggest will always win, but the size resets to gain another level. Find the special hidden bonuses represented by question marks. Those will give extra speed and also some extra actions that will help to survive. Space-bar activates the ever-lasting speed boost, which only needs a small amount of time to reload. Be quick, devour innocent people and leave blood on the water.