To solve the puzzle in the Castle Treasury for the Resident Evil 4 Remake, players must first retrieve the swords. To do so, they must locate the murals on either side of the barred door. Inside the murals, they will find swords that have been placed in the wrong slots. Players should take all 3 swords and add them to their inventory.
The last sword lies beyond the locked metal gate in the same room. To open the gate, players must look through the bars and aim at the gongs. When they have located all 4 gongs, they must shoot them in the correct sequence. The first gong is located on the left wall, the second gong is on the ceiling, the third gong is on the right wall, and the fourth gong is on the floor. Once players have shot the gongs in the correct sequence, the gate will open, allowing them to collect the last sword.
Solving the puzzle in the Castle Treasury for the Resident Evil 4 Remake requires players to retrieve the swords from the murals and aim at the gongs to open the gate. After all 4 gongs have been shot in the correct sequence, the gate will open and players can collect the last sword. With all 4 swords in their inventory, they can now open the secret door and move on to the next area of the game.