For a visual guide on completing the chapter's puzzles and finding all hidden items, watch this full walkthrough:
Chapter 3 typically revolves around complex power restoration and exploration within central game locations, such as the "Gas Production Zone" or similar industrial/daycare settings depending on the specific series entry.
A major objective involves finding and placing batteries to open secure doors. One room specifically requires two batteries ; the first is found on the floor near a hole in the wall, and the second is located further down a corridor, requiring you to pull yourself up to a bedroom area.