How to transfer worlds:
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1. Save your world
2. Click "Export Game" and then select your world
3. Close Minecraft 2D and open the world container
4. Select an empty slot and press ctrl+v (注意这里)
5. Send the world container file to another calculator
6. Select your world and click "Export"
7. Close the world container and open Minecraft 2D
8. Click "Import Game"