1. The Genesis: What Is Aquapark? Before understanding the "Unblocked" phenomenon, one must understand the base game. Aquapark (often referred to as Aquapark.io or Waterpark.io ) is a casual .io-style game developed by MadBuffer. Released during the post- Agar.io boom (circa 2017-2018), it strips the competitive multiplayer genre to its most primal elements: speed, friction, and gravity .