This act often features more complex underwater sections and puzzles involving the Blue Cube. You might need to activate a series of blue block switches in a specific order to open a gate, or use the Cube to navigate strong currents by sinking quickly. One Red Star Ring could be in a hidden chamber accessible only by activating a distant blue switch with the Cube. Another might be found by crushing a specific section of a wall underwater. Be mindful of your air supply in prolonged underwater sections; look for air bubbles or rings to replenish it. The level also features sections with water currents that can either help or hinder your progress.
