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Blue Princeis a puzzle game that is filled with mysteries, twists, and turns. If you want to learn the whole story of what this indie title is about, you’ll need to solve a whole bunch of puzzles and read every memo, book, note, and card you come across.
One of the many secrets that holds more information is the Underpass inBlue Prince; inside the tunnel leading to the final lever, there is a Red Door that cannot be unlocked from the underground. Instead, you’ll need to have a different room inside the house to crack it open.
How to Get to the Red Door
In order to get to the Red Door, you will need to have unlocked the Basement with the Basement Key from theAntechamber inBlue Prince. After that, you will need to find the three Basement doors, unlock them, and figure out the cog puzzle. Once you learn how to walk across the giant cog by turning the cog so it faces one of the three tunnels you have access to, you can walk across it to the blue tunnel on the opposite side of the room.
Next, before you open the gate that is along the blue tunnel in the Underpass near theBasement inBlue Prince, you will need to look for an opening on your left. This will be really hard to see; it blends in really well with the surroundings. Other than a pretty and useless overlook of the forest around the manor, there is only one thing to see in this location: the Red Door itself.
Open the Red Door in Blue Prince
Now that you have found it, you need to go back into the house and keep drafting floorplans until you find theBoiler Room inBlue Prince. Then, you need to rotate the three-pronged steam pipe until thered box on the wall is lit up, showing it is active. This will unlock the Red Door in the Underpass. Keep in mind that you have to walk all the way back to the Underpass, so you will want to make sure you have plenty of steps to get there.
After that, you will just need to walk up to the Red Door for it to open. Now you can continue your exploration of the underground tunnels and puzzles hidden deep underneath your new manor, including a new puzzle box, more lore, and even anotherBlue Princesafewith a red envelope inside.
