How to change a Terraria world to expert
Changing a Terraria world to expert mode isn't something you can do in-game after the world's been created. Expert mode is a choice you make at world creation. However, if you're feeling adventurous and tech-savvy, there are third-party tools like TEdit that can tweak your world's settings, including difficulty. Just remember, messing with game files can lead to unexpected issues, so always backup your world before diving into it.
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Short answer: You can't, not without external tools. Once you pick a difficulty setting for your world in Terraria, it's set for good. If you wanna play in expert mode, you gotta make a new world and select expert during the setup.
Actually, you can change a world to expert with tools like TEdit. I've done it before to spice up the challenge after getting bored of normal mode. It's not too hard, but backup your world first!
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