HardGrind 1.9.0: everything since 1.1.1

Minecraft versions

• Now one jar per version: 1.21.9, 1.21.10, 1.21.11, 26.1 to 26.1.2, 26.2, and 26.3 and newer (the 26.3 jar keeps loading on later versions). 1.1.1 was 1.21.9 only.

OP and Survival

• OP is removed at the source: every player's permissions are always the lowest level, whether they're in ops.json, in a singleplayer world with cheats on, or opened to LAN with "Allow Cheats".
• That blocks every op command (/gamemode, /give, /tp, /gamerule, /op, ...) and the F3+F4 / F3+N game mode switcher.
• The server console and datapack functions keep their permissions now.
• Survival is enforced: players in any other mode are put back on the next tick. In Hardcore, dead players are left in Spectator.

Difficulty and gamerules

• New: the difficulty is locked at what the world had when HardGrind first saw it. The Difficulty button no longer lets you switch to Peaceful mid-fight.
• More gamerules are locked: keepInventory, doDaylightCycle, doWeatherCycle, doMobSpawning, spawnMonsters (1.21.11+), mobGriefing, naturalRegeneration, doImmediateRespawn, randomTickSpeed, playersSleepingPercentage, fallDamage, fireDamage, drowningDamage and freezeDamage.
• Changes (for example from editing level.dat) are reverted within 5 seconds.
• Fixed: 1.1.x only recorded real gamerule values in a development environment. They're recorded properly now.

New: run log and milestones

• /hardgrind log shows the day, play time, deaths, mob kills, a milestone timeline and any notes.
• The big steps of a run are announced and stamped with the day and play time: Stone Age, Acquire Hardware, Diamonds!, the Nether, blaze rods, Eye Spy, the End, the dragon, elytra, ancient debris, full netherite, a full beacon.
• Permanent notes record anything outside HardGrind's control: play without the mod, a crash or force-quit, or anything caught. Players are told on join.
• One line sums up the run when you join, e.g. HardGrind · Day 12 · Run: Ironman · clean · watching since Day 1.

New: locking a world (/hardgrind lock confirm)

• The world won't open without HardGrind. A small datapack points at a sound only HardGrind adds, so without the mod Minecraft stops with "data pack validation failed".
• Safe Mode is caught: the only way in without the mod switches the lock off, and HardGrind notices when it's back.
• Backup if the datapack runs without the mod: everyone is frozen; Creative/Spectator, changed gamerules and a changed difficulty are reverted and recorded; and vanilla's "Lock Difficulty" is set.
• Save-scum guard: restored backups and old copies behind the latest save are caught, and only that copy pays for it. A dead world stays dead even if you restore a backup.
• Force-quit protection: locked worlds save every 2 minutes, and right away when someone dies or drops to 3 hearts.
• Cheat-mod guard: a locked world won't load with X-ray mods, Baritone or hacked clients (Wurst, Meteor, Aristois, BleachHack, LiquidBounce, ThunderHack). Minimaps, inventory tweaks and recipe viewers are fine.
• Tampering checks: the datapack deleted, switched off or edited, hardgrind.marker deleted, a changed difficulty, a rollback, or play time without the datapack all go into the run log.
• Updating HardGrind never counts as tampering: packs written by older versions are recognised.
• /hardgrind unlock confirm takes the lock out again, with a permanent note.

New: ironman (/hardgrind ironman confirm)

• Locks the world and arms it for good. Anything HardGrind catches kills the world: it kicks you every time you load it.

New: hardcore second chance (/hardgrind revive confirm)

• After dying in a hardcore world (click "Spectate World" first), this turns hardcore off for good.
• Everyone who died respawns at their bed or world spawn with an empty inventory, like a normal death.
• The run log and status say "was hardcore" forever.
• Not in ironman worlds. Rejoin afterwards for normal hearts.

New: build worlds (/hardgrind build confirm)

• For building, not runs: /gamemode, F3+F4 and the other commands work again, and nothing is enforced or locked.
• The singleplayer/LAN host gets commands even with "Allow Cheats" off.
• Creative worlds are build worlds automatically. Locked and ironman worlds can't become one.

New: Freecam, fair mode

• Freecam 1.4 and 1.5 are allowed in locked worlds, with collision always on and the camera look-only.
• It also holds on servers and for LAN guests.
• If a Freecam version can't be held to that, locked worlds won't load with it until HardGrind is updated.

Commands and config

• Commands (any player): /hardgrind (status), /hardgrind log, and lock, unlock, ironman, build, revive (each asks you to add confirm).
• config/hardgrind.json:
  • autoLock locks every new Survival world automatically.
  • sharedLedger keeps the save-scum ledger in ~/.hardgrind, shared by every launcher and instance.