Full Basement map and walkthrough in Blue Prince
Briefly

In Blue Prince, accessing the Basement is essential for reaching Room 46. Players must first locate the Basement Key, which involves solving a lever puzzle to open the Antechamber doors. The simplest route to the Basement is through the Foundation, where an elevator leads directly to the main door. Players may also discover alternative entrances like the Cliffside Exit or the Concealed Entrance, but the Foundation remains the most straightforward access point. A complete map of the Basement, detailing its nine key locations, is available.
To access the Basement in Blue Prince, players must first find the Basement Key by navigating through the Antechamber, which requires solving a lever puzzle.
The easiest way into the Basement is to use the Foundation elevator, but alternative entrances like the Cliffside Exit and the Concealed Entrance exist for those with special items.
Read at Polygon
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