How to Solve the Puzzle in the Underdark in Baldur’s Gate 3


To reach the Baldur’s Gate 3 Underdark via the Shattered Sanctum, return to the Goblin Camp, and eliminate any remaining enemies.

Welcome to this guide on how to solve the tricky puzzle in Baldur’s Gate 3’s Underdark. This guide will walk you through the steps you need to take to solve the puzzle, as well as give you ideas for other ways to solve it. No matter how experienced you are as an adventurer or how new you are to the game, you need to know how to beat this challenge to move forward in the story.

Selune’s Defiled Temple will show up early on in the main plot of Baldur’s Gate 3. This place has a hard puzzle that has to do with the different phases of the moon. If you want to go deeper into the Baldur’s Gate 3 Underdark, you must figure out how to solve this puzzle.


Moon Door Puzzle

The puzzle centers around four rotating discs, each representing different moon phases: full moon, half-moon, and new moon symbols. To solve the puzzle, you’ll need to arrange these discs in a specific order. If you’re observant, you might have already noticed that the order of the moon phases matters.

To unlock the Moon Door puzzle, follow these steps:

  • Rotate the right disc once
  • Rotate the left disc three times
  • Rotate the bottom disc twice
  • Rotate the right disc twice
  • Rotate the left disc twice
  • Rotate the top disc twice
  • Rotate the left disc three times
  • Rotate the right disc once

Executing these rotations will align the Full Moons at the top, half-moons in the middle, and new or no moons at the bottom of the door. You can skip the puzzle all together if you have enough Perception. There is a secret lever behind the Selune symbols on the wall. After the door is locked, use Thieves’ Tools to pull the lever to open it. This handy short-cut is especially helpful if you’d rather not solve the problem.

Getting into the Baldur’s Gate 3 Underdark

Once you’ve successfully solved the Moon Door puzzle or employed the shortcut, you’ll gain access to the Baldur’s Gate 3 Underdark. Descend the stairs, which lead to the Selunite Outpost. This marks your entry into a new and challenging area of the game.

Hidden Access via Shattered Sanctum

For those seeking an alternative route to the Baldur’s Gate 3 Underdark, a hidden access point lies within the Shattered Sanctum. To unlock this path, return to the Goblin Camp and eliminate any remaining enemies. Refer to the Goblin Camp page for directions, or use the Waypoint system for guidance. Upon reaching the Shattered Sanctum, you’ll discover lingering enemies. Defeat them to secure your way forward. Continuing your journey, you’ll eventually arrive at the Defiled Temple (coordinates X:392 Y:27), where you’ll face new challenges and choices.



What is the Moon Door puzzle in Baldur’s Gate 3?

The Moon Door puzzle is located within Selune’s Defiled Temple in Baldur’s Gate 3’s main storyline. It involves arranging four rotating discs with different moon phases in a specific order. Solving this puzzle is necessary to progress into the Underdark.

Is there an alternative way to bypass the Moon Door puzzle?

Yes, if you possess enough Perception, you can find a hidden lever among the Selune symbols on the wall. Using Thieves’ Tools after the lever locks will open the door, providing a shortcut past the puzzle.

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