Blue Prince Observatory Puzzle: How to Unlock the Planetarium

Did you know that secret rooms are waiting to be unlocked in Blue Prince? One such room is the planetarium. You can find its floor plans in the observatory. Here’s how to permanantly add this new room to your drafting pool by solving a simple puzzle:

The observatory is one of the most fascinating rooms. It lets you catch a glimpse of the night sky using the telescope and rewards you with coins, gems and keys for viewing constellations. You will need a gem to draft this room.

Inside the observatory stands a large telescope, typically used for viewing constellations. But, in this guide, we will focus on something else. Look near the lens—there’s a hidden compartment that holds the planetarium’s floor plan.

Notice the dial at the base of the telescope? Rotate it counterclockwise to position the telescope directly above the platform.

Now, head up the stairs to reach the platform. You’ll find another dial there—rotate it to lower the telescope closer to the platform.

Now that you are close to the telescope lens, click on the hidden compartment to open it. Click on the planetarium blue print. You have now found a secret floor plan. Click on Yes to add the planetarium to your drafting pool.