Advancement Made!MCDDD now checks Minecraft 26.3: loot tables, exploration maps and the new worldgen.
Tools
MCDDD Check it
Is my pack built right?
Finds the mistakes that make Minecraft skip a file or refuse to load your world.
MCJIG Simulate it
What will my structure build?
Shows what your jigsaw pools really place, piece by piece, across many seeds.
MCVIEW See it
What does it look like?
Walk through your structures block by block, one floor at a time.
Codex Look it up
How does this work?
Every registry, field and command, for every version since 1.13.
Use with AI New
Let an AI assistant run the checks for you.
Claude, ChatGPT, Gemini and other AI helpers can use MCDDD. Step-by-step setup that anyone can follow.
Tip: press 1–5 to jump between tools, like a hotbar.