Introduction The level.dat file is the single most important metadata file for any Minecraft world (Java Edition). It contains global world settings, player-specific data (like inventory, position, and game mode), world features (seed, generator type), and game rules. Editing this file allows you to change world options without loading the game, fix corruption, enable cheats, reset the Nether/End, or even create custom challenge maps.
Inside level.dat , the root tag is always Data , which contains the following major sub-tags: edit minecraft level.dat
For reference: The official Minecraft Wiki – NBT format and level.dat format – stays up to date with each release. Introduction The level