As mentioned before, items are of crucial importance in solving puzzles in this game. Since chapter 5 is mostly room-based, players need to constantly interact with keys in this chapter. However, the clocks in this chapter sometimes may not be that obvious and players need to observe, or even think outside the box when no obvious locks are spotted. For example, a clock may be hidden or there might be a twist before the clearer clue is shown. This chapter might be a bit more tedious than previous ones and players are expected to constantly examine the items and chat with those non-character figures such as the tall white patient in this game. However, there is one thing that players need to be aware of in this chapter. Many of them may have already noticed that since chapter 4, the so-called duotone—the duality of the world, ceased to exist. Players cannot switch in-between two realities to check details and find clues to progress. In this chapter, without such a comparison mechanism, players will solely rely on the contingent interactions with the items and other characters to obtain the puzzle-solving pieces.