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Introducing Netherite! Minecraft 1.11.2, rewritten from scratch in C and CUDA, bit-verified against the real game. This is one trained agent playing in it - then the renderer it actually trains through - then 7,200 live worlds stepping in lockstep on one GPU.

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3:22 AM · Jul 29, 2026

David Watson 🥑

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Left is Mojang's game. Right is mine, replaying the same inputs. Validated on terrain, physics, and pixels - the gates ship in the repo. Can you spot the difference?

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The receipts: my inventory screen minus Minecraft's, amplified 80x so you can see anything at all. 112,796 pixels. 442 differ, each by 0.3%

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Why exactness: it makes an RL sim you can trust. 23/23 recorded tapes replay with physics clean to 1e-9, CPU and CUDA bitwise-identical every tick (all the way to defeating the ender dragon). Train here, replay the same actions in the real Java game, get the same result. There

2,058 actions, one unbroken chain, nothing scripted: spawn empty-handed -> logs -> planks -> sticks -> crafting table -> wooden pickaxe -> stone -> coal. This is the middle of it, unedited, real speed.

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Training mode throws the full rasterizer away. The policy sees a 64x36 block-id camera with depth and edge planes - right pane is the whole observation. That is why thousands of worlds fit on one card.

Numbers (RTX PRO 6000 / 9950X3D, methods + harnesses in the repo): > exact render, 1080p: 35.9 fps GPU, 4.5 CPU > batched sim: 3.0M env-ticks/s at N=8192, 756k agent steps/s The CPU one is bit-identical. The slow one is the oracle.

C, CUDA, no engine, no game jar at runtime. You bring your own copy of the game; every Mojang-derived input regenerates locally, byte-identical. I'm excited to see any and all constructive criticism and what the community can do with this. kernels + source + oracle mod:

GitHub - Infatoshi/netherite

From github.com

yaaaas

@ThePhysicsMemes

Grok explains: """ **It is a from-scratch port/rewrite of Minecraft 1.11.2’s game logic into C (with a CUDA path), not a neural network that imitates or approximates Minecraft.** Elliot Arledge rebuilt the core simulation (terrain generation, physics, blocks, entities,

yup

Youssof Al Toukhi

This is insane

it has been my NUMBER ONE hobby project

cool! is the point to make a more efficient and less resource intensive RL environment?

exactly!

Aditya Tripathi

@AdityaTripathiD

If it doesn't have baby chickens, I don't want it

netherite v2 or v3 maybe

Bonaventura von Jesko

So the next step naturally is to train a local model that can play Minecraft?

this is up to YOU

This is fuckin awesome, nice work bro

tysm <3

I say this a lot but this is awesome! how long did this take?

this attempt took a month-ish

Bernardo Ferrari

I don't understand. Did you reverse engineer from jvm bitcode to c?

no. just pixel

You should do a comparison of a scripted action on netherite vs vanilla minecraft to show the speed-up (Or for example time to reach 1M frames rendered)

it doesnt work on single env this fast though… ill do my best to get a full side by side

Cool… how does this work with copyright tho… is this saying I can download Minecraft 1.11.2 for free and play it? Can foresee this being a problem

no it decompiles your paid-for game

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