Super Mario Galaxy Movie Game
An unofficial Mario Galaxy-style 3D platformer in the browser, where you run around planets and the letters of the Mario logo; about 95% of the code by Claude Code.
Official site supertommy.com, verified Nov 3, 2026. The developer's own site; it is the URL of the developer's Show HN post ("I'm the developer").
Rights holder / original work: Super Mario (Nintendo)
An unofficial fan game that uses Nintendo's Mario, Yoshi, Bowser Jr., Lumas, the series' enemies and items and the Mario Bros. logo, made to celebrate the Super Mario Galaxy Movie. The page says it is not affiliated with Nintendo, and the developer says the Mario models come from the third-party Hello Mario Framework. No source shows a licence from Nintendo. (supertommy)
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Where to play
Every platform this game is on. Links are checked against official sources; we never host or mirror games.
- Play free — official siteBrowserReleasedFree
Runs in a desktop or mobile browser. No download.
Browser (no download) · Mobile · Official link verified Nov 3, 2026.
About Super Mario Galaxy Movie Game
An unofficial fan game that tries to recreate the feel of Super Mario Galaxy in a web browser. Mario runs around small planets and the letters of the Mario Bros. logo, with Galaxy-style gravity fields that pull him onto each surface, and the spin attack, Yoshi to ride, Lumas and Star Bits, coins, question blocks, pipes and warp boxes. There are five enemy types (Goombas, Koopas, Spinies, Octoombas and Bob-ombs) and a multi-phase boss fight with Bowser Jr. It plays with a keyboard, touch controls on phones or a gamepad, with no install. The developer, who goes by supertommy, made it to celebrate the Super Mario Galaxy Movie as a sequel to an earlier fan game, the Super Mario Movie Game, and says it is not affiliated with Nintendo. It was built in 53 days in TypeScript with Three.js and Rapier physics; the developer says Claude Code (Opus) wrote about 95% of the code, while the developer set the architecture and direction. The Mario models come from a third-party fan framework, the Hello Mario Framework. Free.
How it was built
VerifiedThe developer says Claude Code (Opus) wrote about 95% of the code, while they provided the architecture, constraints and direction and looked at some, but not much, of what it wrote. Each feature started as a loose brain dump in the chat; custom Claude Code skills had sub-agents research the codebase, ask clarifying questions and write phased plan documents (87 in total), and further skills reviewed plans and code and ran retrospectives. A 164-line CLAUDE.md file collected hard constraints learned from debugging. The developer says Claude kept falling back to object-oriented code in a data-oriented ECS project and needed dedicated skills to correct it, and that level design with Claude failed completely; the developer had set up the initial project structure and some shared libraries written before using AI. The developer used a $200 Max subscription. No exact model version is named.
- DeveloperGame page: “~95% of the code vibe coded using Claude Code (Opus)”; “87 implementation plans, 36 AI code reviews, 11 retrospectives”. — supertommy
TypeScript with Three.js and Pixi.js sharing one WebGL 2 context, and Rapier3D physics compiled to WebAssembly with SIMD. The developer describes a custom structure-of-arrays ECS (117 systems, per the game page) with no allocations in hot loops, a data-oriented process manager, five kinds of gravity field with spring-damped transitions between them, fake shadows cast along the gravity direction, a camera built from critically damped springs and a debug editor for placing objects. The developer reports 76,000 lines of TypeScript. The hardest parts, by the developer's account, were the camera and the gravity shadows, and attempts to have Claude help with level design failed completely. The Mario models come from the Hello Mario Framework, a fan framework that is now archived.
- Engine / framework
- No engine (TypeScript, Three.js and Rapier3D)
- Languages
- TypeScript
- Team size
- Not disclosed
- Development time
- 2 monthsDeveloper ReportedHacker News (supertommy)
- Development cost
- Not disclosed
- AI-written code
- ~95% of shipped codeDeveloper ReportedHacker News (supertommy)
“Claude Code (Opus) wrote ~95% of the code. I provided architecture, constraints, and direction; looked at some but not much of what it wrote.”Verification notes: Tool, AI share of the code, process, line count and subscription from the developer's Show HN post of 1 Apr 2026 and replies in that thread; the game page repeats the ~95% figure and lists the plan, review and retrospective counts. The play button loads a build from cdn.supertommy.com; the game's code calls no AI services (checked). Development time is recorded as 8 weeks from the stated 53 days. The developer pays US$200 for a Max subscription but does not give the cost of this project, so no development cost is recorded. The developer goes only by supertommy on the site, YouTube, X and LinkedIn; the about page and the post are written in the first person, so the developer is recorded as one person, but team size is not stated. The release day is not stated; the Show HN post is dated 1 Apr 2026, the same day as the Easter egg the page mentions. IP: an unofficial fan game using Nintendo's Mario characters, enemies, items, logo and names; the page says it is not affiliated with Nintendo, and the Mario models are from the third-party Hello Mario Framework, per the developer. No source shows a licence from Nintendo. Location is not stated.
Development history
- Before April 2026
The developer's first fan game, the Super Mario Movie Game, made for The Super Mario Bros. Movie, is published on the same site; this game is its sequel.
Shown on Hacker News by the developer after 53 days of work, with Claude Code credited for about 95% of the code.
DeveloperHacker News (supertommy)
Game performance
Each figure measures something different — concurrent players, owners, downloads and sales are never interchangeable and are never added together. Labels show where each number comes from.
Browser (official site)
Free; no install. Keyboard, touch or gamepad.
No public metrics recorded for this listing.
Not publicly available: Concurrent players (site), Monthly revenue, Gross revenue.
Sales & revenue (all platforms)
Browser game — there are no downloads to count.
Reviews & rankings
Not yet reviewed by our editors.
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Not currently ranked.
No player reviews yet.
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Sources
| Source | Type | Published | Accessed |
|---|---|---|---|
| Super Mario Galaxy Movie Game | SuperTommy supertommy | Official site | Not confirmed | Nov 3, 2026 |
| Show HN: I made a Mario Galaxy game with Claude Code and Three.js in 53 days Hacker News (supertommy) | Devlog | Apr 1, 2026 | Nov 3, 2026 |
| About | SuperTommy supertommy | Official site | Not confirmed | Nov 3, 2026 |
| Super Mario Movie Game | SuperTommy supertommy | Official site | Not confirmed | Nov 3, 2026 |
| Official game page (language check) supertommy | Official site | Not confirmed | Nov 3, 2026 |
- Number of commits
- The Show HN post says 735 commits; the game page says 731 commits over 53 days. (Hacker News (supertommy), supertommy)
