Blue Prince thrives on obscurity. Its maze of mechanics, secrets, and layered interactions often leave players in the dark unless they’ve sunk hours into experimentation. But some of its best features hide behind cryptic room interactions, odd tool combinations, or even a random item placement. Here are some of the best hidden mechanics and upgrades you can use to enhance your runs—assuming you don’t mind a few spoilers.
How to Upgrade the Planetarium Permanently (Blue Prince Tips)
One of the most powerful hidden quests in Blue Prince is upgrading the planetarium with permanent buffs. This only works if you bring the telescope tool into the room. It unlocks the first of five celestial upgrades. You’ll need to repeat this across five separate runs. The telescope can be found in places like Her Ladyship’s bed chamber, the walk-in closet, or lost and found.
Each celestial sighting grants a buff:
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Fenora (red stone): daily apple
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Mamora (guiding light): unlocks ivory dye
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Vea (dark shadow): spawns a dirt pile
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DA (untamed): spawns a trunk
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Mora (homeworld): daily prism key
Once completed, set the room rarity to common for easy access to these buffs. You may also stumble upon coins or keys here.
The Hidden Power of the Electromagnet and Radiation Monitor
Craft the electromagnet by combining a compass with a battery pack. When used inside a locksmith’s room, it automatically sucks up every visible key (excluding lockpicks and special keys). If you’re short on unlockables, this is a must-use tactic.
Another key-saver is the radiation monitor, found in the shelter. Increase the radiation level using an experiment around five or six times. This triggers emergency protocols and unlocks every door in the estate for the day.
Gem Cavern Warning and Jackhammer Risks
Combine a shovel, battery pack, and broken lever to craft a jackhammer. It allows access to the gemstone cavern, letting you mine daily gems. But beware: with each dig, the chance of a cave-in rises. Once it collapses, it’s permanently shut. In testing, this happened even with stability in the 60–77% range.
If you’re desperate for one last gem, it might be worth the risk—but use it sparingly.
Chapel Secret: Where Your Money Actually Goes (Blue Prince Tips)
When you light both altar candles with a burning glass or torch, the chapel reveals a piggy bank NPC called the Keeper of Tithes. Smash it to reclaim all your lost money—one time per playthrough. This stash can help you buy out the showroom or push toward trophy goals.
The Laundry Room is a Hidden Money Printer
Power the laundry room with an electric eel aquarium (ideally sourced from the Chamber of Mirrors). Convert coins to gems and then into steps via the powered washing machine. Wear Arindas and use the silver spoon to boost steps further. With enough planning, you’ll walk your way into a win—literally.
Maximize Room Copies with the Chamber of Mirrors
The Chamber of Mirrors can duplicate room floor plans. Surround it with accessible doorways to unlock all interior buttons. Press the middle button to access the second floor, where you’ll find hidden cupboards and additional items. The real power? Add duplicates of favorite rooms like electric eel aquariums, spare bedrooms, or observatories to your deck.
Not all rooms may be duplicable, but testing continues across the community.
Sleeping Arrangements and Daily Effects
Sleeping in different bedrooms grants different buffs—or debuffs—the next day:
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Her Ladyship’s Chamber: +1 star, -10 steps
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Bunk Room: +1 gem flower
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Servants Quarters: Start with 1 die, half steps
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Master Bedroom: +20 steps (best known bonus)
Effects from other rooms like the boudoir or nursery remain unknown. The guest bedroom appears to have no effect. Share findings if you discover more.
One Final Festive Secret
If you enter the boudoir on Christmas Day (in-game), you’ll receive a surprise pile of gifts: 2 keys, 6 gems, 4 dice, and—yes—a partridge in a pear tree.
