In the game Blue Prince, there is a secret red door in a place called the Underpass. Many players miss it because it is hard to find. But if you are careful and solve the right puzzles, you can open the door and get some amazing rewards. This door leads to hidden rooms, important clues, and a special treasure room.
To find the red door, you first need to reach the Underpass. This area comes after a long path filled with puzzles. You must go past the Cog Wheel Room and find the path that takes you to the Underground Lever, which helps open Room 46. On the left side of the Underpass, you will see a window and a locked red door with a red power box next to it. The box is not working at first. To fix it, you need to send power from another place called the Boiler Room.
In the Boiler Room, look for the steam boilers. You don’t need to fully turn them on. Just find the red pipes and follow them. Turn the pipes until the power goes to the red power box. Once the box lights up, the red door in the Underpass will be powered and you can open it. Go back to the Underpass and you will see that the red door opens like magic.
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Behind the red door, you will find a path to the upper level of the Cog Wheel Room. There are two rooms you can reach here. In the first room, you will find a puzzle that shows you the water levels for the Reservoir. Solving it gives you a +2 Allowance bonus forever. This will help you get more money every day in the game.
In the second room, you will see a locked gate. To open it, think about the date written on many papers in the house. The correct code is M-A-Y-8. After entering the code, press the red button and the gate will open. Inside, you will find a Gem, Red Letter #1, and the Treasure Trove Blackprint. This blueprint gives you +5 Coins every time you place the Treasure Trove room in the game. The more you use it, the more treasure you will find.
The red door is not needed to finish the game, but it gives some of the best hidden rewards. If you love finding secrets, don’t skip the Underpass. Also, know how to drain the Reservoir in Blue Prince.
For More details, visit the Blue Prince Official Website.