Key Items: Ancient Wayshrine Key

　　When you reach the underground lake, inside the mural cave, turn right before entering the lake, and find this on a small altar.

　　Merchant request: Egg Hunt

　　On the wall to the left of the previous project. The island east of the lake is a chicken farm where you can find a golden egg (this will be listed below, don't worry for the moment). Then you have to sell the golden egg to the merchant, who is on the southwest of the lake.

　　Treasure: Alexander Stone

　　Found in the box of a shipwreck in the middle of the lake.

　　Treasure + Weapon: Red 9 Pistol

　　The same place as the treasure before, on the same boat.

　　Treasure: Velvet Blue

　　On the island east of the lake, on a wooden barrel where the chicken farm is located.

　　Golden Egg (for merchant request: Egg Hunt)

　　On the same island as the last treasure. Remember to sell it to the merchant later to complete the request.

　　Treasure: Pearl Bracelet

　　Use old Wayshrine keys on the altar of the lake settlement (northwest of the lake).

　　Request: Catch a big fish for me in the settlement by the lake

　　Use badge key to open the locked door and you will find the blue letters behind the tunnel door. You have to catch a Lunker Bass fish in the lake in front of the boat (we will list the locations below when we arrive, don't worry for the moment).

　　Castellan 4

　　Return from the previous position, go through another door and enter a house, then climb up the ladder to the forest altar area. In this area, you can shoot Castellan through the fence.

　　Key Item: Small Key

　　In the same area as the city lord, the small key on the trolley needs the next treasure.

　　Treasure: Gold Bars

After getting the small key, enter the house located by the lake and open the drawer of the first room on the left.

　　Treasure: Red Gem Ring

　　The same house, walk to the end of the house and fall into the dark basement. Treasure is at the end of the basement where Chapter 1 ends.

　　Bonus mission (help to catch a big fish)

　　You can use spear to catch this big fish near the boathouse in the southeast corner of the lake. Sometimes it may not lay eggs there on the first try, if it isn't there, drive back through the lake and return, it should lay eggs before the boathouse.

　　There are smaller fish nearby, but what you need is the largest fish. When facing the boathouse on the boathouse, it usually swims slightly to the left in front of the boathouse. Then you have to sell it to the merchant (southwest of the lake).

　　Complete the requests for "finding eggs" and "Catching me a big fish"

　　A quick detour to the merchant in the southwest of the lake and sold him the golden eggs and blue croak bass to make room for stock. This completed the two requests to him.

　　Key Items: The Blasphemer's Head

　　Turn the boat to the northeastern corner of the lake and dock in the cave there. Interact with the console through the locked door and press 3 correct icons (see image below). Pick up key items behind it. The next treasure is here too.

　　Key Items: Hexagonal Tablet C

　　In the same room as the last key item, on the right before climbing up. We need this in a temple west of the lake in order to get the treasure later.

　　Treasure: Ruby

　　She had room with the last key item, upstairs, shot down the silver container.

　　Treasure: Fallen Idol

　　It is highly recommended to save manually before solving puzzles! If you do it right, it can be solved in 2 steps, but if you mess it up, it can become very complicated and takes a long time to try and repetitionCan solve it.

　　Before the boss battle, park the boat on the west side of the lake you entered in Chapter 3. There you will find an altar where you can insert 3 hexagonal fragments. Rotate them as shown in the following image to obtain treasure.

　　In assist/standard mode, 2 actions are required: rotate the left side once, and then rotate the top once. On Hardcore/Pro: Rotate the right x2, rotate the left x2, rotate the top x1.

　　If you make a mistake, it will be faster to reload the last save and try again from scratch, otherwise it will become very messy after too many errors rotate.

　　Treasure: Bright Bracelet

　　Driving a boat through the tunnel on the west side of the lake. After the cave you can get off the boat and use the Old Wayshrine Key to open the temple and obtain the treasure.

　　Treasure: Transformed stone

　　A silver bell hangs just above the Treasure Temple on the right in front. Shoot down it to get the treasure (you passed it earlier after leaving the church so you might have shot it down but can't collect it earlier).

Treasure: Velvet Blue

　　Boat to the southwest of the lake and pass through the dripping stone cave. There you can get off the boat on the way to the Bigound Shrine. Shoot down hanging silver containers from the ceiling to obtain treasure.

　　Key Items: Apostate's Head

　　The same area as the previous treasure, at the end of the area above the ladder. You must interact with the console next to the door and press 3 correct icons (see below). Then the door opens and you can pick up the items behind.

　　Goal: Obtain the key to the church

　　Key Items: Church Badge

　　Back to the mural cave that began this chapter. Place both heads on the pedestal (the head of the blasphemer on the left and the head of the apostate on the right). You will have to return from Chapter 3 to the church and insert the badge into the church gate.

　　Goal: Go to the church

Treasure: Butterfly Lantern

　　Back to the merchant in the southwest of the lake, pass through the door next to him and return to the church (the way you walked in Chapter 3). Use Wayshrine Key on Wayshrine.

　　(Yellow Diamond)

　　(Dropped by the ogre leader, but it is not a treasure or a collectible)

　　Goal: Looking for Ashley in the church

　　Key Items: Small Key

　　After entering the interior using the emblem on the church gate, on the right side of the altar. Use this key on the drawer in the church storage room (see next treasure).

　　Treasure: Yellow Diamond

　　In the church typewriter storage room, open the drawer with a small key.

Key Items: Blue Dial

　　On a shelf in the church on the right. After receiving it, pull the lever on the left side of the altar and insert the blue dial into the altar. You then have to rotate the blue, green, red glass around the creature's wings so that all the stained glass fills the entire area but does not overlap each other (pictured below).

　　The above is a detailed introduction to the collection strategy for Chapter 4 of Resident Evil 4 Remake Edition. It can be said that it is a 100% full collection. I hope it will be helpful for everyone to pass the level smoothly.