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Reversing Factorio's RNG

https://gegell.github.io/posts/factorio-rng/
43•jheitmann•4d ago

Comments

pema99•3d ago
Super cool
jvanderbot•40m ago
Yeah, no notes. It's remarkable.

TL;DR: Wired up an in-game predictor of RNG output and used it to only craft legendary items when RNG would line up to roll legendary.

From base to legendary at a suprisingly high rate. Look very closely at the video at the top of the post - what I was seeing didn't sink in until I had finished the article. Amazing.

lowbloodsugar•36m ago
Madman. Brilliant.
strstr•13m ago
I did an easier version of this in my college intro class. There was a class competition that involved rock paper scissors as a subcomponent, and ties were broken with randomness. You could rig Java’s prng so you would win all ties.

The prng was seeded with usec time at first call. I called the rng a bunch of times to harvest entropy, and scanned the plausible usec times to find the seed. Then I primed the prng so I would win ties.

Frankly, I assume I implemented this wrong, but the theory was there lol.

Training a 4B model to produce 81% faster query plans than Postgres

https://rohanbansal.com/qorl
182•polyphilz•2h ago•26 comments

Xiami Mimo 2.6 Live Post-Training Dashboard

https://mimo.xiaomi.com/rl/
62•krackers•59m ago•21 comments

Small programming tricks

https://will-keleher.com/posts/small-programming-tricks-matter/
273•signa11•5h ago•148 comments

macOS 27 Golden Gate: The Ars Technica Review

https://arstechnica.com/gadgets/2026/09/macos-27-golden-gate-the-ars-technica-review/
23•Brajeshwar•1h ago•3 comments

Accurate Models of AMD Matrix Cores

https://arxiv.org/abs/2609.14845
37•matt_d•2h ago•5 comments

Reversing Factorio's RNG

https://gegell.github.io/posts/factorio-rng/
43•jheitmann•4d ago•4 comments

A warning about 'model welfare'

https://mustafa-suleyman.ai/a-warning-about-model-welfare
144•andsoitis•6h ago•377 comments

How good are frontier models at physics?

https://arxiv.org/abs/2609.13009
33•qt31415926•1h ago•10 comments

Vectorized and performance-portable Quicksort (2022)

https://opensource.googleblog.com/2022/06/Vectorized%20and%20performance%20portable%20Quicksort.html
147•mococa•2h ago•23 comments

Dream-RSI: Recursive Self-Improvement through Evolving Worlds

https://arxiv.org/abs/2609.14858
160•bananaflag•7h ago•48 comments

WalShadow: Sub-second Postgres replication to ClickHouse from physical WAL

https://clickhouse.com/blog/introducing-walshadow
12•spathak•5d ago•0 comments

Mistral X Mozilla: Private, Multilingual AI Browsing

https://mistral.ai/news/mistral-x-mozilla/
487•vertigoruntime•12h ago•172 comments

Tell HN: An inside view of Montana's new biotech law

18•niklas_anzinger•2h ago•3 comments

Show HN: An e-ink frame that hears birds and draws them as 1800s illustrations

https://github.com/arnegiacomo/fugleramme
1995•arnemunthekaas•1d ago•232 comments

The Siberian Ice Maiden and the Scythian World

https://patrickwyman.substack.com/p/the-siberian-ice-maiden-and-the-scythian
35•NaOH•1d ago•0 comments

Tell the speakers that you liked their talks

https://ohhelloana.blog/tell-the-speakers/
243•whisper2020•1d ago•67 comments

Show HN: Restarted – a 2026 remake of the classic 2015 startup generator

https://restarted.io/
8•zxcvbn4038•1d ago•0 comments

Learning Programming in an Age of LLMs

https://blog.ploeh.dk/2026/09/16/on-learning-programming-in-an-age-of-llms/
218•moneroloop2018•11h ago•167 comments

The DeepMind Institute

https://institute.deepmind.com/
98•vertigoruntime•6h ago•33 comments

Claude Cowork and chat are now one Claude

https://claude.com/blog/cowork-is-now-claude
173•vertigoruntime•4h ago•182 comments

How big are factorials?

https://eli.thegreenplace.net/2026/how-big-are-factorials/
69•ibobev•1d ago•29 comments

Kyber (YC W23) Is Hiring a Forward Deployed Engineer

https://www.ycombinator.com/companies/kyber/jobs/eturrAR-forward-deployed-engineer
1•asontha•9h ago

Training Text-to-Image Models 3.6× Faster

https://www.linum.ai/field-notes/jit-ddt
6•schopra909•4h ago•1 comments

The Google Play app review process now regularly takes longer than a week

https://gultsch.social/@daniel/117280438824908947
326•inputmice•9h ago•314 comments

Hackers Got Inside a Flock Camera

https://www.wired.com/story/hackers-flock-camera-data-shows-how-system-works/
392•driverdan•7h ago•193 comments

Why a fast-growing German AI startup is moving its parent company from the US

https://www.euronews.com/business/2026/09/16/why-this-fast-growing-german-ai-start-up-is-moving-i...
36•jethronethro•2h ago•12 comments

Show HN: How Stale Is Your AI? Release age and training cutoff for 20 models

https://stale.jock.pl/
65•joozio•8h ago•42 comments

Reverse-engineered Jev-like model

https://github.com/vinnylarouge/jevlike
9•rochansinha•2h ago•2 comments

Can we stop with the uptime percentages?

https://blog.jim-nielsen.com/2026/stop-with-the-uptime-percentage/
121•surprisetalk•5h ago•94 comments

Show HN: I made a flight simulator, except you're just a passenger

https://inflightsimulator.com
410•rkotcher•2d ago•199 comments