Blue Prince: Constellations List & Guide
Image Credits: Dogubomb, Blue Prince
In Blue Prince, Stars are more than just shiny rewards. They’re how you unlock constellations inside the Observatory, and each constellation gives you permanent benefits across all your runs. If you're hoarding stars without peeking through the telescope, you’re missing out.
Here’s a simple guide to every constellation and what it actually does.
How to Get Stars
Draft an Observatory.
Step inside. Boom—you gain 1 Star, permanently.
You don’t spend Stars. They just keep stacking up every time you enter a new Observatory.
The more Stars you have, the better your constellation rewards.
Read More: How to Get Stars in Blue Prince
How to Use the Telescope
Go upstairs and turn the crank to raise the telescope.
Keep turning the crank until it lines up with the ceiling opening.
Look through the eyepiece.
Your current Star total determines which constellation is active, and you’ll get its perk that day.
All Constellations and What They Do
1 Star – North Star
+1 gold coin
2 Stars – The Twins
Two locked trunks appear in the Entrance Hall
3 Stars – The Slice
+3 steps
4 Stars – Diamondus Minor
+1 gem
5 Stars – The Southern Cross
Rooms with four doors appear more often
7 Stars – Farmer’s Apple
Each apple you eat gives +5 steps
8 Stars – Clavis, the Key
+1 key
11 Stars – Diamondus Major
+5 gems
12 Stars – Draxus, the Dead
Dead End rooms become more common
15 Stars – The Sail
Everything in shops is 50% off
20 Stars – Florealla, Bloom of the Sky
Green rooms are more likely to contain special flowers
What If You Have a Random Number of Stars?
If your Star count doesn’t match an exact constellation, the game combines bonuses from lower ones.
Example: 7 Stars might give you Diamondus Minor (4) and The Slice (3).
Final Blurb
If you’ve been ignoring the Observatory, go fix that. Every star you collect gives you something that stacks, and some of the constellation powers are game-changing. Plus, let’s be honest—pointing a telescope at the ceiling is probably the least stressful puzzle in this whole game.
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