To access the Basement in Blue Prince, players need to find the Basement Key by reaching the Antechamber, which involves locating levers to open the doors.
Different paths can lead to the Basement, but the Foundation route is the most straightforward, requiring the Basement Key.
The Basement is part of a larger Underground area in Blue Prince, with key locations like Foundation elevator, Concealed Entrance, Cliffside Exit, and more marked on the map.
Basement activities include solving puzzles like the Tomb puzzle, pallet jack puzzle, and Rotating Gear puzzle to progress towards Room 46 and explore additional areas.
Additional tasks in the Basement include draining the Reservoir, exploring the Torch Chamber with its Sigil puzzle, and unlocking the Precipice area with a chess puzzle.