Mods often store extra NBT in Data → ForgeData or fml . Editing without mod knowledge can break things.
💔 Revive a Dead Hardcore Character / Toggle Hardcore Mode edit minecraft level.dat
Change 1 to 0 to permanently remove the Hardcore restriction from the save file. Mods often store extra NBT in Data → ForgeData or fml
Swap the parameters of your experience without wiping out block progress: Data -> GameType Modification: Update the integer based on your preference: 0 = Survival 1 = Creative 2 = Adventure 3 = Spectator edit minecraft level.dat