A glowing pearl hides under one of three colorful shells (pink, blue, green). Shells swap with water-flow animations, leaving a 0.4-second light trail you can follow. After swapping, draw a complete circle around your chosen shell to select it. Correct guesses earn 2 points (Tide Bonus ×1.5 after 3 streak, Golden Shell +3 every 5 rounds, −1 after 2 wrong streak). Supports 2–3 player turns or Grab Mode.