Key items are crucial for progression, unlocking new areas, and solving puzzles. These include various Keys (Spade, Diamond, Club, Heart), Medallions (Unicorn, Maiden, Lion), Electronic Parts, and Valve Handles. Many puzzles require you to find specific items and use them in the correct location. Always examine key items in your inventory for clues or hidden functions. The game's map will highlight areas where key items are still needed, guiding your exploration.
