The goal of the game is to help the submarine to start from the shore, collect 3 kinds of treasures, and transport them to the surface ship-base following a certain trajectory. The submarine at this level moves both vertically and horizontally. The horizontal movement of the boat is achieved by the player transferring the brain to the "relaxed" state. When the brain activity increases, the boat turns into a vertical movement. The goal is achieved if the submarine has transported all the treasures to the ship-base