Fallout: New York, a full browser Fallout game built with Opus 5.5, zero asset files (X video)

Summary
Chris First presents Fallout: New York, an expansive browser-based retro 3D RPG inspired by the Fallout franchise created entirely via Anthropic’s Claude Opus 5.5. The video demonstrates the project running in real-time in a browser, detailing how all visual geometry, 2D art, and synthesized audio were procedurally generated in code without external media asset files.

What is shown

• [00:00 - 00:11] Aerial panoramic view of post-apocalyptic New York Harbor, the Statue of Liberty, Manhattan skyline, and smoke plumes.
• [00:12 - 00:19] Downtown street level illuminated by procedural billboards, neon signs, and an atlas showing 1,824 runtime-rendered textures.
• [00:20 - 00:39] Landmark locations (Radio City Music Hall, The Plaza, UN General Assembly, High Line railway, St. Patrick's Cathedral, Flatiron Building, Brooklyn Bridge) and a wireframe overlay showing collision meshes.
• [00:40 - 00:48] Weather cycles shifting through irradiated fog, rain, lightning radstorms, and procedural audio synthesis.
• [00:49 - 01:01] Companion recruitment and dialogue interfaces (dog companion "Borough", ghoul "Gentleman Jim Malone", and super mutant "Khan" atop the Empire State Building).
• [01:02 - 01:14] Interior and exterior quest locations, including an arena fight in Madison Square Garden, a laser-guarded vault in the Federal Reserve Bank, and a ghoul waiting at a bus stop.
• [01:15 - 01:34] Vault 120 opening sequence, character creation "You're S.P.E.C.I.A.L." book, and the fully functioning Pip-Boy 3000 interface displaying stats, local/world map, quest logs, and perks.
• [01:35 - 01:52] First-person and third-person gameplay showing the V.A.T.S. targeting system against a Deathclaw, slow-motion kill cam, weapon switching (pistol, shotgun, rifle, alien blaster, minigun, missile launcher, power fist), and the Fat Man launching a mini-nuke.
• [01:53 - 02:04] Gameplay sub-systems: vendor bartering with bottle caps, workbench crafting, a 2D holotape arcade minigame (Red Scare!), terminal hacking, and a lock-picking minigame (Secur-O-Matic).
• [02:05 - 02:29] Sunset harbor view, Vault 120 blast door opening to the Wasteland, and the title card "Fallout: New York".

Claims & numbers

• The game code was generated using Claude Opus 5.5 and runs entirely inside a standard web browser (the presenter says).
• The codebase contains approximately 290,000 lines of JavaScript packaged in a single HTML file (the presenter says).
• The only external dependency downloaded is the Three.js 3D graphics library (the presenter says).
• There is not a single external audio file; all music and sound effects are generated procedurally at runtime using code (the presenter says).
• The game features 1,824 procedural textures painted at runtime (the presenter says).
• The world map contains 117 unique explorable locations, spanning 8 avenues (10th to Lexington) and 31 streets (59th to State), along with Broadway on its actual diagonal (the presenter says).
• The environment incorporates 49,000 physical colliders (the presenter says).
• Narrative content includes 262 branching dialogue trees and 112 named NPCs (the presenter says).
• Character progression and content track 7 SPECIAL attributes, 13 skills, 70 perks, 93 quests, 20 hidden Vault-Tec bobbleheads, 46 weapons, and over 200 item types (the presenter says).

Notable quotes

• [00:01] "Everything you see here was generated using Claude Opus 5.5, and it runs entirely in your browser."
• [00:44] "And did I mention there isn't a single audio file in the game? Every sound is made using code."
• [02:06] "It's about 290,000 lines of JavaScript in one HTML file. Its only download is the Three.js graphics library."

Assessment
This is a technical showcase demoing a fan recreation of classic 3D Fallout gameplay engineered as a monolithic single-file web application generated by Claude Opus 5.5. The gameplay systems (V.A.T.S., Pip-Boy, bartering, terminal hacking, dialogue trees, Three.js rendering) are actively demonstrated running live in engine.

Lyrics & themes
The narration serves as a technical tour of the project's architecture and features, set against a synthesized vocal and instrumental cover of the 1934 standard "Blue Moon" (famously featured in Fallout: New Vegas).

• [00:00 - 00:48] Narration: Introduces the procedural generation of graphics, textures, streets, and audio synthesis.
• [00:49 - 01:34] Narration: Outlines characters, quests, starting Vault 120, character customization, and Pip-Boy menus.
• [01:35 - 02:04] Narration: Showcases combat, V.A.T.S., weapons, bartering, crafting, and mini-games.
• [02:05 - 02:28] Narration: Recaps code size, dependency footprint, and invites players to explore.
• [02:30 - 02:49] Vocals: "Blue moon, now I'm no longer alone / Without a dream in my heart / Without a love of my own"

Lore & references

• Fallout Universe Lore: References iconic franchise elements including Vault-Tec, Vault 120, the Pip-Boy 3000, V.A.T.S., bottle caps currency, Deathclaws, Super Mutants, Ghouls, Stimpaks, Rad-X, and the Fat Man nuclear launcher.
• New York Landmarks: Adapts real-world NYC geography to the post-apocalyptic setting (Madison Square Garden, Brooklyn Bridge, High Line, Flatiron Building, Federal Reserve Bank of New York, Empire State Building).
• AI Model Generation: Credits Anthropic's Claude Opus 5.5 for generating the code, procedural shader routines, Web Audio synthesis, and canvas-drawn textures.

Visual style & craft
The visuals utilize low-poly 3D models and runtime canvas-rendered procedural textures rendered in real time through Three.js. The aesthetic mirrors early 3D post-apocalyptic action RPGs (such as Fallout 3 and Fallout: New Vegas), featuring signature sepia and sickly green atmospheric fog, dynamic lighting, CRT terminal phosphor green user interfaces, and wireframe diagnostic overlays.

Described by gemini-3.8-flash on 2026-09-30 from the video's audio and frames.