Use the following solution below to obtain the King and Queen Plug:
Step 1: Upon entering the room, take the Queen Plug from the left side door and put it in the door on the right.
Step 2: Proceed through the door and go up the stairs on your right. Take the King Plug and jump down. You should land right next to the door that you originally put your Queen Plug into.
Step 3: Head back through the door (the one with the stairs on the right), but this time put the King Plug into the door socket on your right. Make sure you take the Chemical Flamethrower or Spark Shot from the rack (this weapon changes depending on Leon/Claire first/second play through) and unlock the door behind you.
Step 4: Leave the room by taking the original door you used to open with the King Plug. Take the King Plug out of the door socket and proceed back through the room to claim the Queen Plug.
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