Learning how to use a Gear Wrench is essential, as this double-edged item can lead to unfavorable outcomes if you don’t understand its working mechanics.

The latest puzzle mystery game, Blue Prince, is both challenging and intriguing, requiring players to explore every corner of Mt. Holly to uncover the secrets of the estate. Fortunately, you can collect various items on your run that help in your journey to discover Room 46. Among the various items, the Gear Wrench is a notable one, which adjusts the rarities of mechanical rooms.
While it can be a powerful tool, using it without proper knowledge can result in a backfire. This guide explains how the Gear Wrench works in Blue Prince and how to use it effectively.
How To Use Gear Wrench in Blue Prince

You use the Gear Wrench to adjust the rarity of the rooms in the game. This means you can make a room spawn more often, or less often, whichever you prefer. This gives you a greater degree of control over your run and also helps you plan out your long-term strategies better.
Be careful while using the Gear Wrench, however, as it can also hamper your run. Since the outcomes are not guaranteed, it may decrease the spawn rate of common mechanical floor plans like Security and Utility Closet.
On the other hand, if you’d like to increase the spawn rate of rare mechanical rooms like Laboratory, Pump Room, and Boiler Room, using the Gear Wrench can be incredibly helpful. Moreover, drafting a higher number of gear-type rooms contributes to solving the Mechanarium puzzle.
Avoid using the Gear Wrench on mechanical floor plans like Security and Utility Closet, as it may drastically increase their rarity and make them harder to spawn in the draft pool. If you don’t prefer using the Gear Wrench, consider trading it for another item at the Trading Post.
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