Chapter 4 is also getting increasingly psychologically intense. The storyline gets more complicated and confusing. In the first part of hidden world, players have to solve the water and fireberries puzzle. Items involved in this part are for example the pillow, knife and water bucket and so on. The central element of this part is water and the item to interact with it. Players will also constantly use the ladder to clime up and down in this part. Then, moving into the next part, the game gets even more tense. The scenario shifts to a spooky cemetery and players must interact with creepy items such as the coffins. Besides, this part also involves conversational element as players need to talk to Mr. Deern and Sabastian. Players need to use the items to obtain certain objects needed and then return to the conversation to push the game progress. This also means players will need to use the previous items more than once and go back and force to some locations to solve the puzzle in this part.