How to use the Skull Key in Stardew Valley
Everybody talks about the Skull Cavern, but don't forget the Skull Key also works in the arcade in the Stardrop Saloon. It unlocks the Junimo Kart game, which is a neat little bonus for those who like a break from farming and spelunking.
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Short and sweet: Skull Key = access to Skull Cavern. More danger, but better loot. Get your combat boots on!
The Skull Key unlocks the Skull Cavern in the Calico Desert. Once you get to the bottom of the Mines (level 120), you'll find the Skull Key. Take it to the desert, and look for a cave in the northwest corner. Inside, there's an elevator that doesn't work, but don't worry! The Skull Key lets you dive as deep as you can go in the Skull Cavern. Just watch out for those tougher monsters and bring plenty of food and bombs!
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