: Large pipes throughout the reactor can be physically detached by pulling them, and certain doors have a rare (0.2%) chance of producing a mysterious knocking sound, adding a layer of "lore" and atmosphere to the sandbox. New Tools and Decorative Items
If your version of People Playground doesn't have the "Unleashed" mods pre-installed, you can add them manually: People Playground - Guide :: PPG building basics people playground v1 27 5unleashed upd