Chunky-Challenge

⚔ Chunk Challenge
A Minecraft 1.21.11 Fabric mod that turns every new chunk you walk into into a mini arena!

“Every chunk is a challenge. Kill the mobs. Survive the timer.”

🎮 How it works
Run /challenge start and the challenge begins instantly in your current chunk.
Every time you enter a new chunk, a world border closes in around that exact 16×16 chunk — you’re trapped until you defeat the mobs.
Random mobs spawn — by default from ALL mobs in the game: zombies, creepers, witches, skeletons… but also pigs, cows, sheep, chickens and every other mob! All of them get the Glowing effect, so you always see them through walls.
The border stays closed until every mob is killed. Then it opens — and the next chunk brings the next arena.
A permanently visible HUD timer (top center) shows your run time, the current arena level and how many mobs are still alive.
Teleporting mobs (e.g. Endermen) are automatically pulled back into the arena, so you never get stuck with a closed border.
Died? The current arena resets so you can keep playing.
/challenge stop ends the challenge and opens the world again.
⚙️ Commands
start, stop and config require operator permission level 2. /challenge status works for everyone.

Command Description
/challenge start Start the chunk challenge (first arena appears immediately)
/challenge stop Stop the challenge and open the world
/challenge status Show current status and all settings
/challenge config Change a setting (saved automatically)
Config options
Option Values Default Description
allmobs on/off on ALL mobs can spawn (including passive ones). off = hostile mobs only
bosses on/off off Allow bosses (the Wither) to spawn
difficulty on/off off Mobs get stronger every arena level (+HP, +damage, +speed; every 5 levels one extra mob)
solidchunks on/off off Fill every challenge chunk completely with one random block (gold, diamond, slime, ice …)
mobs number ≥ 1 1 Base number of mobs per arena
maxmobs number ≥ 1 3 Maximum number of mobs per arena
borderdamage number ≥ 0 0.2 Damage per second dealt by the border
health number ≥ 0 2.0 Bonus max health per arena level (with difficulty)
damage number ≥ 0 0.05 Bonus damage per arena level (with difficulty)
speed number ≥ 0 0.02 Bonus speed per arena level (with difficulty)
Boolean values accept: on/off, true/false, 1/0, yes/no (and even an/aus, ein/nein).

Examples
/challenge config difficulty on — enable scaling difficulty
/challenge config solidchunks on — every chunk becomes a giant block cube
/challenge config mobs 3 — three mobs per arena
/challenge config allmobs off — hostile mobs only
📁 Configuration file
All settings also live in config/chunkchallenge.json (created automatically on first run). You can edit the block palette for solidchunks there:

json
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{
“includeAllMobs”: true,
“allowBosses”: false,
“difficultyScaling”: false,
“solidBlockChunks”: false,
“mobCount”: 1,
“maxMobs”: 3,
“borderDamage”: 0.2,
“difficultyHealthPerArena”: 2.0,
“difficultyDamagePerArena”: 0.05,
“difficultySpeedPerArena”: 0.02,
“solidBlockPalette”: [“minecraft:gold_block”, “minecraft:diamond_block”]
}
📦 Requirements
Minecraft 1.21.11 (Java Edition)
Fabric Loader 0.19.3+
Fabric API 0.141.6+1.21.11
Java 21
🛠 Installation
Install the Fabric Loader for Minecraft 1.21.11.
Put Fabric API (0.141.6+1.21.11) into your mods folder.
Put chunkchallenge-1.0.0.jar into your mods folder.
Launch the game, join a world and run /challenge start.
⚠️ Notes
solidchunks permanently replaces the terrain of every challenge chunk with the random block — back up your world if you care about it!
In pure water biomes (open ocean) the arena can’t find a dry spawn point and dissolves immediately — just keep walking to the next chunk.
The world border is a global world property, so the mod is designed for singleplayer or a small group playing the same arena.