The first on each wall means the one furthest away from the workbench (or closest to where we came from). The Right means the one where the Pawn Sticker is on a socket, and Left Wall means the one where a Knight Sticker is on a socket. The solution on your first and second playthrough will be different for this one. Now we finally have all 3 plugs that we need! Because we created a shortcut through the Workroom / Sewers, we can trace back our steps to get back to the Monitor Room. You actually passed by this earlier when you arrived at the Sewers, but couldn’t take it with you cause taking the Rook Plug raises a bridge that blocks off the main path. Exit the Workroom and the Rook Plug will be in front of you in a wall socket. Rook Plug: Open the Floodgate at the Lower Waterway (Lower Sewers) to the Workroom Lift. Don’t forget the Queen Plug on your way back out and retrace your steps to the Monitor Room to deliver the two plugs. Then you can reach the King Plug upstairs. There’s actually a small Chess Plug Puzzle there of its own, but all you have to do is take out the Queen Plug and insert it in a different Socket to open a door.

After making it through the Bottom Waterway you come to the Supplies Storage Room. Then use the handle on a floodgate to get to the Bottom Waterway, where many poison monsters lurk. To get there, you must first get the T-Bar Valve Handle from the Treatment Pool Room. Queen & King Plug: They are found in Supplies Storage Room in the Lower Sewers. The ones that are missing are the Queen, King, Rook. There are, however, six Sockets total so you’re missing 3 Plugs. Some preparation work is required: When you arrive in the Monitor Room for the first time, only 3 Chess Piece Plugs are in the Sockets.

Plug puzzle resident evil 2