Blue Prince is an engaging indie puzzle game rich with enigmatic narratives, intricate puzzles, and unexpected developments. To uncover its comprehensive storyline, players must diligently solve a myriad of puzzles and thoroughly examine every memo, book, note, and card they encounter throughout their journey.
A significant area of intrigue is the Underpass, where players will discover a mysterious Red Door situated deep within the tunnel that leads to the final lever. This door is unique in that it cannot be opened from the underground itself; instead, it requires exploration of a separate room within the house to unlock its secrets.
How to Access the Red Door
To reach the elusive Red Door, players must first unlock the Basement using the Basement Key obtained from the Antechamber. After gaining access, the next step is to find and unlock the three Basement doors. Once this is accomplished, players must engage with a cog puzzle. Successfully manipulating the cog will allow you to traverse it to the blue tunnel located on the opposite side of the room.
Before proceeding through the gate along the blue tunnel in the Underpass, take note of an inconspicuous opening to your left. This entry is easily overlooked due to its seamless integration with the surrounding environment. While it offers a scenic view of the forest encircling the manor, its primary significance lies in revealing the Red Door itself.
Unlocking the Red Door in Blue Prince
Having located the Red Door, the next task is to return to the house and meticulously draft new floor plans until you identify the Boiler Room. Once inside, manipulate the three-pronged steam pipe until the red box on the wall lights up, indicating that it is activated. This action will unlock the Red Door in the Underpass. Remember, the journey back will require ample steps, so plan your route accordingly.
Finally, approach the Red Door for it to open, granting you access to further explore the underground tunnels and the multitude of puzzles concealed within your new manor. Expect to encounter a new puzzle box, additional lore, and even another Blue Prince safe containing a red envelope.