Recognize the entrance
What the doorway looks like
The blue frame and crescent distinguish the Planetarium from a golden Treasure Room.
Crescent-moon doorway
Original game-art examples, shown facing upward where relevant. Door textures and appearance can vary with the floor or item effects.
Find the entrance
How to enter Planetarium
Unlock it by collecting three qualifying astronomy items in one run. Later runs can generate it behind a locked door.
What you can find
Rewards and opportunities
A collectible from the Planetarium pool.
Before you commit
The risk to plan around
Skipping a guaranteed Treasure Room trades an immediate item for a chance at a later Planetarium.
- The base chance is 1%. Skipped Treasure Rooms add 20 percentage points on later eligible floors.
- Entering a Treasure Room affects the accumulated chance; Telescope Lens changes some rules.
Useful connections
Items that affect this room
Reference
Repentance rules and room variants
This guide describes the room type. Exact layouts and contents can vary. The rules use Repentance references; Repentance+ can change them.