Adjust your screen’s gamma settings until you see the hidden UV paint on the floor tiles. Follow the pattern of the lost constellation.
The subreddit r/AncientSecrets has been debating the "Golden Key" for three years. The leading theory (proposed by user "HopliteJones") suggests that the Golden Key is actually a metaphor for the save file itself. When you unlock the "Celestial Engine," you are essentially manipulating the game’s RAM.
