He wanted to play Need for Speed: Underground 2 with his brother again, and the web page ended up with over ten thousand people online at once

th0mk/nfsu2-web brings the 2004-year-old PC game Need for Speed: Underground 2 (NFSU2) into the browser and runs a server so thousands can cruise that neon city at once. The repo was 18 days old at the time, with 864 GitHub stars. But what really took off was the website you can play the moment it opens, and the stars spilled over from there. Below: why it took off, where the stars came from, and how much room is left if you want to chase stars with an "old game in the browser" project.

"I know everyone is sick of vibecoded projects"

Around 2026 20, a developer named th0mk posted in both r/NFSU2 and r/needforspeed, titled "I've ported NFSU 2 to the browser, with working multiplayer" (I got Need for Speed Underground 2 running in the browser, multiplayer works). The first line of the body addressed the obvious reaction: "I know people may be a bit tired of the vibecoding projects popping up everywhere…" (post date inferred from the numbering and later coverage).

This was the first public repo on his GitHub account, which he'd opened 2014 years earlier. The homepage of nfsu2.xyz states the motivation:

"About 20 years ago, my brother and I played this game together. So I tried porting it to the browser so we could play together once more. It worked out surprisingly well, and things got a little out of hand."

Two days later, on Oct 22, the game outlet TheGamer ran a story, writing "at 3 a.m. US Eastern, over 1,000 players were in Bayview" and saying it was "as easy to pick up as a Flash game". By Nov 6, at 11 p.m. Beijing time, the live counter on the nfsu2.xyz homepage read 11,928 people playing, 4,455 in free roam.

What it is

An open-source project plus a website. Technically it's three steps: statically translate the original SPEED2.EXE x86 code into C and compile it to WebAssembly; swap DirectX 9 for WebGPU; audio runs on Web Audio. It works in Chrome and Firefox, runs up to 120 fps, widescreen, with gamepad, wheel and touch support, and it even plays in Safari on iPhone.

The core feature is multiplayer. NFSU2's most famous mode was free roam in the Bayview city, and EA's official online service shut down long ago. The author rewrote a server in Rust so free roam can hold thousands of players in one city: you see other people's cars, honk, form convoys, send quick chat phrases (the other side sees them in their own language), turn on ghost mode to drive through others, and save data syncs across devices.

The recompilation technique wasn't his invention. The homepage says the project is forked from TalhaMudo/NFSU2Recomp's MIT version from October 16. That upstream only went public in October 12, shipped only a native macOS build, and had no multiplayer. The README says "Built with the help of Claude Code." It has 18 days and 1,018 commits, with the author making 983 of them.

Why this one took off

In October alone, a dozen or so static-recompilation projects for old games popped up on GitHub, and NFSU2 had three or four of them. This one got traction because of the following, and most of these have little to do with the tech.

One: it runs the moment you click. The repo says "bring your own game copy," but the site serves about 2GB of game data straight from its own server (Notebookcheck 11-04 pointed this out). Other NFSU2 ports either make you copy game files yourself and install an APK, or are single-player only. EA no longer sells the original, and installing it on modern Windows means wrestling with DRM and widescreen patches. "No account, no install, works on your phone" is close to zero friction for someone who wants to relive their childhood.

Two: multiplayer gives you short-video material. "It runs in a browser" only gets a single moment of surprise. "You bump into other people online" is what makes something shootable. On TikTok, @fl8me_ posted "NFS IS STILL ALIVE!! WE ARE SO BACK" with 267k views and 23k likes, and another clip from the same account, "LOOK WHO I BUMPED INTO", got 125k views. @cloudual's "Need for Speed Underground 2 Is Playable Online in Your Browser" got 126k (TikTok, 11-06).

Three: a human story. "I wanted to play with my brother again." No in-app purchases; Ko-fi donations only buy a Discord role. Media and players are happy to speak up for someone like that.

四,赶上了话题。 同期 Halo CE、《使命召唤:黑色行动》僵尸模式都出了浏览器版,TheGamer 把它写成一股潮流;XDA 11-04 的标题直接是「有人用 Claude Code 让 NFSU2 跑进了浏览器」,AI 圈也被吸了进来。11 月 3 日到 5 日,eTeknix、TechPowerUp、Notebookcheck、XDA、Retro Dodo 接连报道。

Five: the community plugged in. On the homepage's language list, Brazilian Portuguese, Polish, Turkish, Ukrainian, Czech and more are translations and voice work from national mod communities made over a decade ago, and he credited each one as he integrated them. In recent issues, people are asking for speed-test zones, car clubs and license plates, and others are asking for Lithuanian, Bulgarian and Greek translations.

How the stars came

(Daily GitHub stars, 11-06.)

The curve has no spike; it climbs steadily by 30 to 80 a day, +401 over the last 7 days and +375 over the first 7. That looks like players arriving in waves via the "source" link on the site, not one promoted account pushing it. The fork-to-star ratio is about 22%, well above typical, which suggests a lot of people actually want to run it or modify it.

Compared with tens of thousands of concurrent players, 864 stars isn't much. Within the same recompilation wave, valentderah/totk-pc-recomp (a PC port of Zelda: Tears of the Kingdom) was created at 10-29 and gained 4,824 stars in a week, reaching 5,113; BotW's SavageWindRecomp has 3,193, and the PS2 web recomp snuri00/ps2-web-recomp has 1,395 (GitHub, 11-06). Stars measure how hot an IP is among developers, not how many players it has (inference). Most people who play NFSU2 never visit GitHub.

Who else is in the space

People are already making SEO pages to siphon its traffic, which means there are plenty of people searching "NFSU2 browser."

Two landmines

• Copyright. The site distributes EA's game data directly. A line at the bottom of the homepage reads "Rights holders: legal (at) nfsu2.xyz," so the author clearly knows. A DMCA takedown is likely eventually (inference), and then the site may have to switch to "bring your own game," which drops the friction right back to square one.
• Upstream turns on them. After being forked, the upstream moved to a proprietary license that bans porting. nfsu2-web states it only uses code from 10-16's MIT version, which is probably legally defensible, but how the two sides get along from here is unclear.

The author pays for servers and bandwidth himself. The Ko-fi goal reads "two top-tier Claude subscriptions plus a year of server costs" and is 67% funded, with the amount not disclosed.

If it were you

B: the formula "old game + browser + large-scale multiplayer" can be copied, and AI has sped up development a lot, but this wave is already crowded. How many stars you get depends on which IP you pick. The step that really made this one take off, directly hosting the data, is exactly the one you shouldn't copy.

Who it suits: developers who know some reverse engineering, WebAssembly or graphics APIs, and who are willing to grind through two or three weeks with tools like Claude Code; old-game fans who know where that game's community lives and which mode they miss most.

Who it doesn't suit: people with no low-level experience who expect AI to write a recompiler from scratch for them; people who only want stars and don't want to run servers and a community (once multiplayer is live, there are bugs and new requests every day); people who can't take the legal risk, or who think a "bring your own game" version would blow up like this one (it wouldn't, the friction difference is too large).

How to do it:

1. Picking the IP: it needs to meet three conditions. It had a signature social or multiplayer mode, its official servers are shut down, and the original is hard to run on modern systems. Also search GitHub first to check that nobody has recompiled it yet, or that someone has but only made a single-player native build. Racing games, arcade fighters, and the cities and lobbies of early MMOs suit this better than story-driven single-player games.
2. Build on an existing recompiler: N64Recomp and XenonRecomp are public, and this project itself was forked from someone else's MIT version. Your job is the browser layer and the multiplayer server; don't reinvent the wheel from scratch.
3. Make multiplayer into a shootable scene: chance encounters, honking, convoys and quick chat phrases spread better than "120 fps."
4. Route the data through "bring your own game": let players point the web page at their local original files. Far fewer people will show up, but the project can survive. Keep no game data at all in the open-source repo.
5. Bring in the national mod communities: integrate their translations and credit them by name. That's both a feature and a distribution channel; it's how older players in Eastern Europe and Latin America found it.

How to get users: launch first on the game's Reddit fan sub, copying its title format ("I ported X to the browser, multiplayer works"), and open the body with "I know everyone's sick of vibecoding." Then send the link to journalists at TheGamer, XDA and Notebookcheck, who are already covering "old games in the browser." Make the README spell out "how to play" and "made with AI": the first is for players, the second for developers and tech press. Stars will keep flowing in from the site.

How early you need to be: this wave started in October, and TheGamer already says "dozens in the past few months." Media appetite for this kind of story will probably run out by Q1 of 2027 (inference), and good IPs will get snapped up quickly. If you're doing it, launch within a month.

Signs you've misjudged it: (1) EA or another major publisher starts issuing DMCAs against this kind of web port in bulk, and even the "bring your own game" versions get taken down, which closes this path; (2) similar projects launched after this one still sit at a hundred or two stars despite media coverage, meaning the wave has passed; (3) conversely, if someone reaches thousands of concurrent players with the "bring your own game" approach, hosting isn't necessary, and this path is wider than estimated here.