Level Difficulty is lightweight mod backports per-world difficulty storage to Minecraft 1.7.10. Using Mixin, it saves the difficulty value directly inside each save's level.dat file—just like in versions 1.8 and above.
Features
No more global difficulty settings. Each world now remembers its own difficulty independently, so you can play on Peaceful in one save and Hardcore in another without having to reconfigure every time you switch.
It's solves a long-standing annoyance for 1.7.10 players who manage multiple worlds with different challenge levels. Perfect for anyone who hops between many world worlds.
Limits
The mod does not include the difficulty-locking feature introduced in 1.8+. That means you can still change the difficulty in-game at any time.
The Level Difficulty Team
