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.
What Does the Gear Wrench Do in Blue Prince?
The Gear Wrench is a special item you can obtain while exploring the estate. It does not have any effect until you start drafting a mechanical room. Mechanical rooms, or gear-type rooms, are likely associated with technology or machinery and can alter the effects of other rooms or mechanisms. These include Workshop, Security, Utility Closet, Laboratory, Pump Room, and Boiler Room.
When drafting a mechanical floor plan while having the Gear Wrench in your inventory, the rooms’ rarity may be permanently adjusted. This drastically affects how often mechanical rooms appear in the drafting pool, either increasing or decreasing their spawn rates.
How To Use Gear Wrench in Blue Prince

While adjusting the rarity of the rooms can offer a great advantage, it can also result in backlash if not used properly. Since the outcomes are not guaranteed, it may decrease the spawn rate of common mechanical floor plans like Security and Utility Closet.
However, 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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