Requires the library mod Collective.

This mod is part of Serilum's Customization Bundle mod.
Difficulty Lock adds an easy way to configure the difficulty in all (new) worlds. Can be useful for modpacks, or just in your singleplayer experience if you have a default difficulty you always play with. There are config options to force the Hardcore gamemode, disable cheats, or prevent Creative mode from being selected.

The Create World Screen is correctly updated with the config settings. Also works on (dedicated) servers.

Configurable: ( how do I configure? )
The priority shows how the mod handles when multiple gamemodes are set to true in the config. E.g. if all are enabled all new worlds will be peaceful.
forceHardcoreMode (default = false): Sets the world game mode to hardcode mode and ignores the other difficulty settings when enabled.
disableCreativeModeSelection (default = false): Whether Creative Mode should not be possible to select in the world creation screen.

forcePeaceful (default = false): Priority 1: Sets the difficulty in any world to peaceful when enabled.
forceEasy (default = false): Priority 2: Sets the difficulty in any world to easy when enabled.
forceNormal (default = false): Priority 3: Sets the difficulty in any world to normal when enabled.
forceHard (default = true): Priority 4: Sets the difficulty in any world to hard when enabled.

forceCheatsDisabled (default = false): Whether the cheats option should be forced to be disabled on the initial world creation screen.
shouldLockDifficulty (default = true): When enabled, locks the difficulty in any world so it cannot be changed.
shouldChangeDifficultyWhenAlreadyLocked (default = false): When enabled, also sets the difficulty in worlds where it has already been locked.

With the default configuration, all worlds will be set to hard with the difficulty locked:

The Create World Screen is also updated.
Here the config options forceHard and forceCheatsDisabled are true:

The mod also allows users to be forced to play in Hardcore Mode, via the config:

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You may freely use this mod in any modpack, as long as the download remains hosted within the Modrinth ecosystem.

Serilum.com contains an overview and more information on all mods available.

Comments are disabled as I'm unable to keep track of all the separate pages on each mod.
For issues, ideas, suggestions or anything else there is the Github repo. Thanks!

Changelog

Platform May 21, 2026

Fixed

Platform
May 21, 2026