What does the Rusty Key do in Stardew Valley?
rusty key = sewer access. Sewers = Krobus. Krobus = best deals in game. Don't sleep on this, folks!
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The Rusty Key unlocks the Sewers in Stardew Valley! Once you get it from Gunther after donating enough items to the museum, you can explore a whole new area beneath the town. It's not just for show, either. Down there, you'll find Krobus, the only friendly monster who sells unique items, and a bunch of other cool, kinda gross sewer stuff. Definitely worth the effort to unlock!
Simple answer: It opens the Sewers. Why you'd wanna go there, you ask? To meet Krobus, duh. Best shopkeeper in the game, IMHO.
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