A test of memory as well as physical skill. At the entrance, the player is given a set of four symbols, arranged in a 2x2 grid. They have to remember their arrangement, then duck underwater and climb to pass the barriers dividing the room. On the other side, they have to insert blocks into an idol to match the pattern - then they're given a second pattern for the idol back at the entrance. Once the second pattern is entered, the crystal is revealed.