Master Bedroom (Luigi's Mansion 3)
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On the right side of the Master Bedroom, Luigi must use Suction Shot to reveal a pendulum platform. Luigi must get to the power source to disarm the lasers. The key is located at the top, so Luigi or Gooigi must move either to the left or the right to move the pendulum upwards to obtain it. If Luigi falls off the pendulum, he will lose 10HP. Gooigi should use the pendulum platform to reach the yellow gem, which is near the top of the room and behind some bars he can go through.