When you run the application for the first time it will automatically load the default Minecraft save directory for your operating system. Copy the entire save file directory to a safe place in case your editing goes awry. You can run all three OS versions as a stand alone portable application. You can read more about the tool at the official thread or visit the Github page downloads are available for all three platforms at both links. To that end the aptly named NBTExplorer, an cross-platform tool available for Windows, Mac, and Linux, is a tailor made tool for the task. Further, you need to use the same formatting Minecraft uses: Named Binary Tag (NBT).

In order to make permanent changes to the gamemode state you need to edit the game file, the level.dat. Permanently Change Your Minecraft Game Mode In order to make a permanent and global change to the world save you’ll need to do a little editing in the guts of the save file.

When you use this trick, you toggle your game mode, but you don’t permanently toggle the state of the entire world save (and using the multiplayer command /defaultgamemode doesn’t work correctly on single player worlds). We’ll show you how to toggle this later in the tutorial. Turning a hardcore game into a creative game creates a weird sort of hybrid wherein you get all the powers that come with creative mode, but if you were to die in creative mode (either by falling into the void or using the /kill command on yourself) you’d lose your world just like you would in regular hardcore mode. Hardcore mode is actually just survival mode wherein death leads to world deletion (so you have only one life to live in your hardcore world). What’s interesting about this trick in regard to hardcore mode, however, is that hardcore mode (even though we refer to it is a game mode) is actually a separate game flag. This trick can also be used to turn a hardcore mode game into a creative mode game. You can use this trick to temporarily alter the game mode of both survival and creative mode games.

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