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A developer gave Anthropic’s Claude (Opus 5.5) a deliberately open brief to build its own stickman game and kept iterating. The result, built in one day with no human-written code, is BEATDOWN, a rhythm-based stick-figure brawler, plus a nine-game ‘Stickman Arcade’ and a stick-figure animator, all running in browsers and phones as roughly 24,500 lines of dependency-free JavaScript.
A developer who gave an AI model a deliberately loose brief — build your own stickman game, no clone, no tutorial project — says the model returned BEATDOWN, a rhythm-based stick-figure brawler, and that continued prompting over a single day expanded it into a nine-game Stickman Arcade with a stick-figure animator. According to the account, all of it was written by Claude (Opus 5.5), with the developer writing no code and acting only as a director, answering questions and supplying screenshots. The full set runs in any browser and on phones, and consists of about 24,500 lines of plain JavaScript with zero dependencies, the developer said.
The headliner, BEATDOWN, is a brawler built around timing rather than button-mashing. Every attack is judged against a soundtrack generated live in the browser: on-beat hits deal 1.5× damage, landing four consecutive on-beat hits triggers a bonus attack with a shockwave, and enemies telegraph their strikes on one beat and land them on the next, allowing a guard-tap counter. The developer describes rhythm as a bonus rather than a requirement — off-beat play can still clear waves, it simply deals less damage and sounds thinner.
The roster is twelve original fighters, each a musical archetype — Drummer, Conductor, DJ, Bassist, Punk, Soprano, MC, Jazz Cat, Shredder, Virtuoso, Beatboxer and Producer. Each has a passive ability, two specials, a cooldown skill and an ultimate called the DROP, for sixty abilities in total. Performance is graded by a Groove rank running from MUTE to FEVER, with better play adding musical layers.
Every game can be redrawn in nine art styles — CHALK, RISO, LASER, SHEET, ZINE, PIXEL, BRUSH, BLUEPRINT and NOIR — which the developer says change how fighters, venues, effects, lettering and menus are drawn, not just their colours. BEATDOWN offers seven venues with distinct rules (the Rooftop has no walls; the Cruise Ship deck tilts), a TOUR mode, local VERSUS play for two players on one keyboard or two gamepads, BOSS RUSH, BLITZ, a seeded DAILY MIX shared by all players each day, and a SOUNDCHECK practice mode with early/late timing feedback.
The other eight games, built on a shared engine, cover ragdoll physics (Stickman Dismount), call-and-response dance (Pose-Off), rhythm-platforming (Beat Runner), stealth (Noir Heist), tower-style defense (Band Defense), boxing, soccer and skateboarding. The tenth card, Stickman Animator, lets users pose figures by dragging joints, build frame-by-frame animation with ghosted neighbouring frames, add generated in-between frames, and export looping GIFs, sprite sheets or stills.
Could AI Turn a Stickman Game Into an Arcade?
A developer handed Claude (Opus 5.5) a deliberately loose brief — “make your own stickman game, no clone, no tutorial project” — then steered for one day. The result: BEATDOWN, a nine-game Stickman Arcade, and an animator, all generated as dependency-free JavaScript running in any browser.
BEATDOWN: Timing Over Button-Mashing
Every attack is judged against a soundtrack generated live in the browser. Rhythm is a bonus, never a requirement — off-beat play still clears waves, it just hits harder and sounds better in time.
Telegraph System
Enemies signal strikes one beat ahead and land on the next — a guard-tap counter window.
The DROP
Each fighter’s ultimate ability, capping a kit of one passive, two specials and a cooldown skill.
Seven Venues
The Rooftop has no walls; the Cruise Ship deck tilts. Every venue plays by its own rules.
Six Modes
TOUR, local VERSUS, BOSS RUSH, BLITZ, a seeded DAILY MIX, and SOUNDCHECK practice with early/late timing feedback.
Twelve Fighters, Sixty Abilities
Each original fighter is a musical archetype with a passive, two specials, a cooldown skill and the DROP ultimate.
Drummer
Percussion archetype with beat-keeping passives.
Conductor
Commands the tempo of the fight itself.
DJ
Loop-layered specials and remix-style skills.
Bassist
Low-end pressure fighter, groove-fuelled.
Punk
Aggressive, high-risk rhythm brawler.
Soprano
High-register precision striking style.
MC
Flow-based combos and crowd control.
Jazz Cat
Improvisational, off-beat trickster kit.
Shredder
Fast-attack guitar-hero archetype.
Virtuoso
Technical mastery across all timings.
Beatboxer
Mouth-music rhythm and vocal percussion.
Producer
Samples enemies and rebuilds the mix.
Nine Games, One Shared Engine
The AI first wrote a shared game kit and engine guide, then built each game on top — letting all nine share art styles, timing systems and controls.
BEATDOWN
Rhythm-based fighting, twelve fighters, seven venues.
Stickman Dismount
Ragdoll physics chaos with stick figures.
Pose-Off
Call-and-response dance battle game.
Beat Runner
Rhythm-platforming to a live soundtrack.
Noir Heist
Sneak-and-steal in monochrome shadows.
Band Defense
Tower-style defense with a musical twist.
Stickman Boxing
Stick-figure pugilism in the ring.
Head Soccer
Soccer, played entirely with heads.
Beat Skate
Skateboarding trick lines on the beat.
Stickman Animator
Pose joints by dragging, animate frame-by-frame with ghosted neighbours, add generated in-betweens, export looping GIFs, sprite sheets or stills.
Nine Art Styles, Every Game
According to the developer, these styles change how fighters, venues, effects, lettering and menus are drawn — not just their colours.
How the Build Was Steered
The developer’s role — steering, answering questions, sending reference screenshots — resembles a director or producer more than a programmer.
Open Brief
“Make your own stickman game. No clone, no tutorial project.”
BEATDOWN Playable
First playable build in under an hour; live on the site in under two.
Shared Engine First
The AI wrote a game kit and engine guide before the individual games.
Nine Games Built
Each game stacked on the shared kit — styles, timing, controls in common.
Director Signs Off
No human-written code; the developer only steered and supplied screenshots.
What’s Confirmed vs. What Isn’t
| Claim | Source | Status |
|---|---|---|
| One-day build time | Developer’s first-person account | ~ Unverified — iteration and prompting time not itemised |
| 24,500 lines of JavaScript | Developer’s account | ~ Unverified independently |
| Zero dependencies, code-generated assets | Developer’s account | ✓ Testable — games run in any browser, inspectable directly |
| No user data collected | Developer’s account | ~ Unverified — progress stays in the player’s browser |
| Gameplay quality | Developer’s characterisations | ~ Untested here — descriptions are not reviews |
| Playable free, browsers and phones | Developer’s site | ✓ Directly checkable by readers now |
Three Quotes From the Build
“I gave a AI model a deliberately loose brief: make your own stickman game. No clone, no tutorial project, just its own take on a genre everyone knows.”
“Everything was built by Claude (Opus 5.5) in one day. I wrote no code. I steered: I answered its questions, sent screenshots and kept asking for more.”
“Rhythm is a bonus, never a requirement: you can play off-beat and still clear waves. It just hits harder and sounds better in time.”
What It Demonstrates
- A scope — nine games, a GIF-encoding animator, live music and art — that would conventionally take a small team weeks or months.
- Fully procedural, dependency-free web games rather than asset-heavy downloads.
- The director-not-programmer working pattern AI vendors now promote for complex builds.
- No image or audio files: every asset generated by code at runtime, so it loads as plain JavaScript and runs on phones.
Open Questions
- How much prompting, testing and iteration was folded into “one day” — and were reworks needed?
- Will the arcade grow — more fighters, venues, games via the same steering process?
- Will a fuller write-up follow, including prompt counts, failure points and any hand-written fixes?
- The source text is truncated mid-sentence; later build-stage details are incomplete.
What a One-Day Arcade Says About AI Coding
The project is a data point in the debate over how far AI coding assistants can carry a project when given creative latitude rather than a tight specification. The developer’s role — steering, answering questions, sending reference screenshots — resembles a director or producer more than a programmer, which is the working pattern AI vendors now promote for complex builds. A nine-game arcade with a shared engine, an animation tool with its own GIF encoder, and live-generated music and art represents a scope that would conventionally take a small team weeks or months.
The technical approach also matters for distribution: because there are no image or audio files and every asset is generated by code at runtime, the games load as plain JavaScript, run on phones, and collect no user data — progress stays in the player’s own browser. That makes the arcade a working example of fully procedural, dependency-free web games rather than asset-heavy downloads.
How the Build Was Steered
The build began with a deliberately open brief: the developer asked the AI for its own take on the stickman genre rather than a clone of an existing title. According to the account, BEATDOWN was playable in under an hour and live on the developer’s site in under two. For the wider arcade, the AI first wrote a shared game kit and an engine guide before producing the individual games on top of it — a structural decision that let nine games share art styles, timing systems and controls.
The underlying model is Anthropic’s Claude Opus 5.5, used here as the sole code author. The developer states plainly: “I wrote no code.” The account is published with a disclosure that the post itself was created with AI assistance.
“I gave an AI model a deliberately loose brief: make your own stickman game. No clone, no tutorial project, just its own take on a genre everyone knows.”
— The developer (project account)
Claims Worth Verifying Before Playing
All performance claims — the one-day build time, the 24,500-line code count, the zero-dependency architecture and the privacy claim that the games collect nothing — come from the developer’s own first-person account and have not been independently verified. The post was itself written with AI assistance, and the source text is truncated mid-sentence at the description of how the arcade build proceeded, so details of the later stages of the process are incomplete.
Gameplay quality is also untested here: descriptions of mechanics, venues and modes are the developer’s characterisations, not reviews. It is not stated how much prompting, testing or iteration was folded into the “one day,” nor whether any issues emerged during play that required rework.
Where the Arcade Goes From Here
The games are described as free and live on the developer’s site, playable now in browsers and on phones, so readers can evaluate the claims directly. The natural open questions are whether the AI-built arcade will receive further iterations — more fighters, venues or games added through the same steering process — and whether the developer publishes a fuller account of the build, including prompt counts, failure points and any hand-written fixes. The truncated description of the arcade build process suggests a more detailed write-up may exist or follow.
Key Questions
What is BEATDOWN?
A stick-figure fighting game in which every attack is judged against music generated live in the browser. On-beat hits deal 1.5× damage, and a run of four on-beat hits triggers a bonus shockwave attack. It has twelve fighters, each with a passive, two specials, a skill and an ultimate called the DROP.
Who actually wrote the code?
According to the developer, the AI model Claude (Opus 5.5) wrote all of it — about 24,500 lines of plain JavaScript with no dependencies — in one day. The developer says they wrote no code and acted only as a director, answering questions and supplying reference screenshots.
How many games are in the Stickman Arcade?
Nine games plus a tenth card that is Stickman Animator, a posing and frame-by-frame animation tool that can export GIFs, sprite sheets and stills. The games include the brawler BEATDOWN, Stickman Dismount, Pose-Off, Beat Runner, Noir Heist, Band Defense, Stickman Boxing, Head Soccer and Beat Skate.
Do the games work on phones, and do they collect data?
The developer says all games run in any browser and on phones with touch controls, and that they collect nothing — progress is stored in the player’s own browser. These claims have not been independently verified.
What do the nine art styles change?
According to the developer, switching style redraws everything — fighters, venues, hit effects, lettering and menus — rather than just changing colours. Examples include CHALK (blackboard), PIXEL (8-bit arcade) and NOIR (rainy silhouettes under neon). The chosen style carries across the whole arcade.
Source: Thorsten Meyer AI
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