Luis Rosias

Obsessively building YouGame (remix. upload. play)
Made rollback brawl and P+ w/ ranked Google & GOAT Melee Coach

[Luis Rosias @CrunchBuilds]

I want to clear up some things about AI coding and software engineering in 2026 that a lot of the smash community seem to misunderstand from the perspective of an ex-Google AI engineer and startup founder because SOMEONE has to bite the bullet and tell you the truth even if you hate them for it.

Most of you guys seem to have this perception that if code is written by AI, it is slop, and if it is artisanal grass fed human code, it is high quality, when the EXACT OPPOSITE is the truth now. Frontier AI is better at coding than 99.9% of humans now, like Phillip is better than 99.9% of smashers, which is why every single software engineer from mag 7 to 1 person startups (hi👋) is using AI to code, and how you can get YouGame in less than a month and rollback brawl/P+ with ranked in less than a week.

The skill expression comes primarily from product design, UI/UX taste, system architecture design and how effectively you can coordinate swarms of AI agents to do useful things.

Rollback brawl for example, took about 200 agents total across 4 machines doing at peak 16 simultaneous rollback simulations across 46000 replays and cost 5 Claude max subscriptions across 3 days. Ranked and matchmaking took another 2 days. Polishing it up with everyone’s feedback will probably take a couple days to a week more depending on my bandwidth. It’s not theft, it’s not me being a god, it’s a swarm of AI agents working together to make whatever we want real.

Already, agents have picked up every hate tweet, every comment, every kind bug report and have triaged, prioritized, implemented and deployed much of the work. I’M the problem, because now that you guys are giving so much feedback, the agents can finish work faster than I can review, test and guide it. I can’t keep up with you all.

So please do all your favorite game developers and modders and founders a favor and stop forcing them to live in this don’t ask don’t tell world where they are all AFRAID to admit they use AI to build, like LITERALLY everyone else, for fear that their game or work is going to get labeled unskilled AI slop and cancelled, and instead join and collaborate with us in experimenting with these latest tools and early builds to collectively make the games we could only DREAM of as kids.

We’re entering a world where every existing game is going to become essentially open source. Decompiled and recompiled by agent swarms that can do the work that used to take humans years, in days. It’s going to mean that ANYONE is going to be able to make games, modify games, mashup games, and build on top of games in whatever way they want.

We’ve figured out how to scale AI agents, but we haven’t figured out a way to scale the human taste, judgement, intuition and collaboration needed to go from first iteration slop to polished gem and how to make sure everyone is rewarded in proportion to their contribution when something succeeds, from individuals contributors to original game publishers.

That’s the problem YouGame is trying to solve. How to create a collaborative open source system where everyone can remix, upload, collaborate on and monetize games, and where the site itself evolves in the same way.

The goal for me with this isn’t money. The purpose for money in Yougame is exclusively to reward great creators and to put as much AI compute in the hands of the people as possible so that we can collectively make the best games possible, because you guys already know, that the best innovations in gaming don’t come from greedy profit seeking, they come from passionate individuals working together who do it for the love of the game and the joy of creation.

I believe so deeply in the world of amazing games that we can create. One where every modder and builder can create and share and be fairly compensated for their amazing work without fear of DMCA or lawsuit or cancellation, but I can’t do it alone.

We have to find a way to do it together.

[Luis Rosias @CrunchBuilds]

@theo At this point, the only benchmark I trust is Theobench LOL

[Luis Rosias @CrunchBuilds]

No. I’m still able to build significantly more faster than 99.9% of people. The knowledge I built up over a 15+ years is still hugely relevant and even more so moving forward.

It’s kind of like saying to a former programmer, do you feel like becoming a CTO with a team of engineers below you took away the thing that made you special?

Coding was never what made an engineer special. It was always their intuition and ability to design great systems and ship great product.

[Luis Rosias @CrunchBuilds]

@luppi91 @Anconoid69 LMAO

[Luis Rosias @CrunchBuilds]

Alright, what should we rename Orca to?

Post other cool name ideas if you like them better than these two.

[Luis Rosias @CrunchBuilds]

I’m leaning YG Baiji. It’s kinda fun to say LOL

[Luis Rosias @CrunchBuilds]

@Anconoid69 Has to be claude themed if anything lol. Chat has barely written any code for YouGame

[Luis Rosias @CrunchBuilds]

@Armonte @riennezelda Wait, low key that name is kinda sick. I was just gonna name it yg-dolphin but honestly that name is fire. Ughh. Easy to understand name or sick AF name. DECISIONS

[Luis Rosias @CrunchBuilds]

Btw I know I haven't been posting as much the last few days. The main reason is that I'm working on a big refactor and new set of features, which will allow improving P+/Brawl rollback, and well any game on YouGame for that matter, to be completely open source, collaborative and community driven.

This was my goal from the beginning, but the way I released and the technology I released with communicated the exact opposite.

So stay tuned, there's some really big changes coming and I think it's going to be awesome.

[Luis Rosias @CrunchBuilds]

@riennezelda Soon. I'm changing it to ygdolphin overnight tn.

[Luis Rosias @CrunchBuilds]

Top Dawg is hosting the FIRST EVER P+ rollback tournament tonight at 8PM ET!

https://t.co/PjMQwF4BJe

Come enter and see how far you can go!

[Andrej Karpathy @karpathy]

Dusting off this tweet from April because this gap in shared understanding of LLM capability is *widening*. It's now less "two groups of people speaking past each other" and more a sharp funnel.

- Napkin math somewhere around 6B people (~75% of the population) have barely come in contact with LLMs at all.
- Around 1-2B (~20%) are casual and infrequent users of free-tier ChatGPT-like products. This group sees derpy chatbots and treats them a bit like a better Google search, a writing aid, or etc. Maybe an agent tries to book you a flight. I have non-tech friends who (reasonably, imo) say they have not much use for it at all. Even many professionals outside of math&code are in this tier. For example, execs and many other functions spend a lot of their time talking to other people, so while they understand what is happening intellectually, it is still second-hand and a bit abstract.
- Now we get to professional use of frontier-grade LLMs in math&code. Somewhere around 20M people (0.2%) see first-hand that large, complex projects that used to take them weeks/months can now be completed by agents with a prompt. Building apps, copying apps, translating apps, decompiling apps from binaries... This has all happened very quickly and recently - less than 1 year ago, I was writing code manually by hand, typing memorized computer code commands into a code editor character by character, occasionally pressing Tab to autocomplete a little chunk of code.
- And finally we get to the ~5,000 people (~0.00006%) with access to frontier-grade systems internally. The external world has seen the preview. It looks like swarms of thousands of agents collaborating over weeks on software mega projects: minting zero days, running cyber attacks and defenses at machine speeds, discovering new science, advancing the frontier of mathematics. Things that would have taken top professionals in the industry years of work. Meanwhile, human review and comprehension are starting to fall behind. For example, people are still involved in the "archeology" of the OpenAI-HF incident from many months ago. Mathematicians may be poring over the 722 manuscripts on frontier mathematics for a while.

The funnel is driven by a combination of factors:
1. The impact scales with ambition, problem size, and horizon. A question with a paragraph answer barely stresses the system. You need a reservoir of big, difficult problems that you really care about. This aspect drives the consumer / professional dimension of the funnel.
2. The jaggedness of the system (which I have written about a lot separately). Capability peaks in domains that are digital, verifiable and economically valuable. This is because LLM capability emerges from reinforcement learning on verifiable rewards on a curated environment mixture driven by revenue potential. This aspect primarily drives the area (e.g. math&code) dimension of the funnel.
3. Access. Free-tier, paid-tier, internal.

So this is the weirdness of the moment. The general public has mostly not interacted with these systems. When they have, it looks like a derpy chatbot. The majority of professionals still see only a modest uplift. And a small sliver of professionals are experiencing the vertigo of the curve going vertical. And it is all happening at the same time.

[Luis Rosias @CrunchBuilds]

@1campagne I’m gonna start posting the changes on the p+ listing itself so you all can track. Also starting to post rough roadmap there as well. Taking some time to setup so all this is automatic, but making progress every day.

[Luis Rosias @CrunchBuilds]

Rolling out a bunch of the big changes I’ve been hinting at little by little today. If there’s any issue at any point today, leave a comment and it’ll be rolled back to the previous stable version within 15 minutes.

I’ll stop deploying changes and leave things stable a few hours before the tourney tonight at 8. Thanks to all the early adopters for dealing with the messy update process so far.

Should start to become much more smooth, stable and community driven from now on.

Continuously improving every day!

[Luis Rosias @CrunchBuilds]

@Player1_SSB Regardless I'm open sourcing everything very soon anyways (once security changes go through that allow this), and plan to let the community drive the project on YouGame moving forward. After that, I'll be stepping back on this and focusing more on YouGame features

[Luis Rosias @CrunchBuilds]

If I could go back in time:

Contact brawlback team as soon as I had a working initial build and collaborate on playtesting and integration.

Announce build as an early alpha build that shows a lot of promise but needs the help of community feedback to rapidly improve.

Be transparent about AI use and explain how agents would try to fix all the bugs people found.

Make cashbox conditional on us finding all the bugs to make the experience very high quality.

But alas, I’m a dumb human, so I can only promise to be less dumb in the future.

[Luis Rosias @CrunchBuilds]

@Player1_SSB I have offered in every way possible to work with them including giving them the yougame listings and I've been mostly ghosted or rejected. At this point they seem to just want to take what's working from orca and use it to release their own standalone client and matchmaking.

[Luis Rosias @CrunchBuilds]

@zaiphirion The best software engineers care more about getting good product in people’s hands the most efficient way possible than they do about solving esoteric math puzzles by themselves. They feel empowered, not replaced by AI.

[Luis Rosias @CrunchBuilds]

@anshnanda Can you explain reasoning? Very curious

[Luis Rosias @CrunchBuilds]

You loosen the grip but increase the value. It’s the same lesson music labels learned when they decided to stop DMCA’ing all music and dance videos and decided to just start accepting royalties for each one and appreciate the free advertisement. It was only possible because YouTube existed to be the one to make the deal between the indie creators and the big music labels. Sound familiar?

The only thing that forced this to happen is that the technology behind music changed. It went from an easy to control physical disk, to an instantly distributable fully malleable online media file.

So imo the end state is obviously going to be the same because the core dynamics are identical.

[Luis Rosias @CrunchBuilds]

This is the beauty of open source.

You cannot "steal" open source. You don't have to ask for permission. Anyone can do with it whatever they want.

The only thing you have to do is give credit to the people who came before and make it open to everyone who comes after.

YouGame is not required to play rollback brawl or P+. I'm working hard every day to make it the best place to play rollback brawl or P+, but you can play wherever you want.

Rollback brawl is open source, and it belongs to everyone.

[NyxTheShield @NyxTheShield]

Okay but what if I took the code that actually worked from the thing and ported it to the netplay branch

1f delay at 90 ping test, we also had a 200 ping (!!) , 5f delay test that worked pretty well from japan to US

[Luis Rosias @CrunchBuilds]

They never had the threat of clean room reimplementations, thats my point, but I might be a few months ahead of twitter here since there hasn’t been a viral one yet. In the same way you’re seeing all the decomp and game mashups right now, you will see IP free reimplementations of games that feel and play exactly the same but that you can monetize. The threat of people building competitors on top of those copyright free clones is what gets them to finally allow building on top of their games instead.

[Luis Rosias @CrunchBuilds]

What part of my argument did you disagree with? Nintendo is a company that likes to make money. If your choices are: let people build on your games and make a bunch of money, or don’t let people build on your games and get a bunch of AI cloned competitors, which one do you think they’ll prefer?