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A developer who asked an AI model to design its own stickman game ended the day with a ten-item Stickman Arcade: a rhythm brawler called BEATDOWN, eight more browser games and an animator, all code-generated with no image or audio files. The build, by Claude Opus 5.5, reportedly took one day and about 24,500 lines of JavaScript.
A developer gave an AI model a deliberately open brief — design your own stickman game — and by the end of the day had a ten-item Stickman Arcade: nine free games and a stick-figure animator that run in any browser and on phones. The build, attributed entirely to Claude Opus 5.5, the AI model, reportedly totalled about 24,500 lines of plain JavaScript with zero dependencies, according to the developer’s own account.
The headliner is BEATDOWN, a stick-figure fighting game judged against the beat. Every button press is scored against a soundtrack generated live in the browser; on-beat hits deal 1.5× damage. Landing four on-beat hits in a row triggers a bonus hit and shockwave, and enemies telegraph attacks on one beat and strike on the next, allowing timed counters. Rhythm is described as a bonus rather than a requirement — off-beat play can still clear waves.
The roster is twelve original fighters built as musical archetypes — Drummer, Conductor, DJ, Bassist, Punk, Soprano, MC, Jazz Cat, Shredder, Virtuoso, Beatboxer and Producer. Each carries a passive ability, two specials, a cooldown skill and an ultimate called the DROP, for sixty abilities in total. The game spans seven venues with distinct rules, including a wall-less Rooftop, a tilting Cruise Ship deck and a Strobe Rave that goes dark between beats, plus modes such as TOUR, BOSS RUSH, BLITZ, DAILY MIX and local VERSUS for two players.
The remaining eight games — from boxing and stealth heists to skateboarding — share the same engine: Stickman Dismount, Pose-Off, Beat Runner, Noir Heist, Band Defense, Stickman Boxing, Head Soccer and Beat Skate. A tenth card, Stickman Animator, lets users pose figures by dragging joints, add in-between frames and export looping GIFs or sprite sheets. According to the developer, there are no image or audio files anywhere — every fighter, venue and sound effect is generated by code while playing, and the games collect no data, storing progress in the player’s browser.
I SET AI LOOSE ON A STICKMAN GAME — AND IT BUILT AN ARCADE
A developer handed an AI model a deliberately loose brief: design your own stickman game. By day’s end there were ten arcade cards — a rhythm brawler called BEATDOWN, eight more browser games and an animator — all code-generated, with zero image or audio files.
The build is attributed entirely to Claude Opus 5.5 in one day: roughly 24,500 lines of plain JavaScript, no dependencies, no hand-written code. The developer steered.
BEATDOWN — FIGHTING JUDGED AGAINST THE BEAT
Every button press is scored against a soundtrack generated live in the browser. Rhythm is a bonus, not a requirement — off-beat play can still clear waves.
TWELVE FIGHTERS, BUILT AS MUSICAL ARCHETYPES
Each fighter carries a passive ability, two specials, a cooldown skill and an ultimate called the DROP — sixty abilities in total.
TEN CARDS, ONE SHARED ENGINE
The remaining eight games — from boxing and stealth heists to skateboarding — share the same engine kit. The tenth card is a full stick-figure animation tool.
BEATDOWN
The headliner: fighting judged against a live-generated soundtrack, with timed counters, shockwaves and the DROP ultimate.
STICKMAN DISMOUNT
Classic stick-figure ragdoll chaos running on the shared engine.
POSE-OFF
Match and hold poses in this multiplayer-style showdown.
BEAT RUNNER
Rhythm-inflected running built on the same beat engine.
NOIR HEIST
Stick-figure heists with stealth mechanics and noir styling.
BAND DEFENSE
Defend the stage with the arcade’s musical flavour.
STICKMAN BOXING
Squared-circle stickman pugilism.
HEAD SOCCER
Browser-friendly arcade football with a stickman twist.
BEAT SKATE
Skateboarding tricks timed to generated beats.
STICKMAN ANIMATOR
Pose figures by dragging joints, add in-between frames and export looping GIFs or sprite sheets — powered by a custom GIF encoder written from scratch by the AI.
HOW THE BUILD UNFOLDED
THE LOOSE BRIEF
“Make your own stickman game. No clone, no tutorial project, just its own take on a genre everyone knows.”
BEATDOWN IN <1 HOUR
The first output was reportedly playable in under an hour and live on the developer’s site in under two.
SHARED KIT FIRST
For the wider arcade, the AI wrote a shared game kit and an engine guide before running additional builds.
TEN-CARD ARCADE
Nine games plus the animator, one of nine art styles carried across every card, changing how everything is drawn.
Each style changes how fighters, venues, effects and menus are drawn — not just a colour swap.
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’s postEverything was built by Claude (Opus 5.5), the AI model, in one day. I wrote no code. I steered.
— The developer’s postThere are no image files and no audio files. Every fighter, venue, drum, bass line and sound effect is generated by code while you play.
— The developer’s postWHAT’S PROVEN — AND WHAT ISN’T
All build claims come from a single self-reported, AI-assisted post that is itself truncated mid-sentence. No independent audit exists.
| Claim | Source | Status | Open Question |
|---|---|---|---|
| One-day build timeline | Developer’s figure | ~ Unverified | Not independently audited |
| 24,500 lines of JavaScript | Developer’s figure | ~ Unverified | Code count not reviewed externally |
| No hand-written code | Self-reported | ~ Unverified | Human prompting effort not quantified |
| Zero image/audio assets | Playable games | ✓ Testable | Readers can inspect the running games |
| Games run in any browser | Developer’s account | ~ Unverified | Cross-browser/device performance unknown |
| Code quality under review | — | ✗ Unknown | No independent code review published |
| No data collected | Developer’s account | ~ Unverified | Progress stored in player’s browser only |
AT A GLANCE
WHO WROTE THE CODE?
According to the developer, all code was written by Claude Opus 5.5 in one day. The developer wrote no code and instead steered the model with questions, screenshots and repeated requests.
WHAT IS BEATDOWN?
A rhythm-based stick-figure fighting game. Every attack is judged against a live-generated soundtrack; on-beat hits deal 1.5× damage, and twelve fighters carry four abilities each — sixty in total.
HOW MANY GAMES, WHICH PLATFORMS?
Nine games plus a stick-figure animator — ten cards total. They run in any modern browser and on phones with touch controls, no installation required.
ANY IMAGE OR AUDIO ASSETS?
No. All visuals and sound are generated by code at runtime — roughly 24,500 lines of dependency-free JavaScript, including a custom GIF encoder in the animator.
What This Shows About AI Code Generation
The project is a data point in an ongoing debate about how much coherent software an AI model can produce from a loose brief. The developer’s stated division of labour — no code written by hand, direction provided through questions, screenshots and iteration — suggests the model handled not only individual functions but architecture decisions, such as a shared game kit and engine guide reused across nine games, plus a custom GIF encoder written from scratch.
Procedural generation of all art and audio from plain JavaScript also demonstrates a model of lightweight, dependency-free web software that loads and runs anywhere, including phones. For readers following AI-assisted development, the account illustrates how far prompting-as-steering has moved from single-file scripts toward full multi-product builds. The claim remains a single self-reported account and has not been independently verified.
From One Brawler to a Full Arcade
According to the developer’s post, the project began with the single brief to make an original stickman game — explicitly not a clone or tutorial project. The model’s first output, BEATDOWN, was reportedly playable in under an hour and live on the developer’s site in under two. The developer then continued requesting more.
For the wider arcade, the account says the AI first wrote a shared game kit and an engine guide, then ran additional builds — a process the truncated post does not fully describe. The result is an arcade where one of nine art styles (CHALK, RISO, LASER, SHEET, ZINE, PIXEL, BRUSH, BLUEPRINT and NOIR) carries across every game, changing how fighters, venues, effects and menus are drawn rather than swapping colours.
“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’s post
Claims Awaiting Independent Verification
All build claims come from a single self-reported post, which was itself created with AI assistance, and the source text is truncated mid-sentence, cutting off the full account of how the arcade builds were run. The 24,500-line code count and the one-day timeline are the developer’s figures and have not been independently audited.
It is not clear from the available material how much revision or human prompting effort was needed beyond the described steering, how the games perform across browsers and devices, or whether the code quality would hold up under review. The provenance of the AI’s design choices versus the developer’s screenshots and direction is also not fully separated in the account.
Where the Arcade Goes From Here
The developer indicates the games are live and free to play in browsers and on phones, so the immediate next step for readers is simply to try them and evaluate the claims firsthand. If the pattern of iteration continues, further games or refinements to the shared engine are plausible follow-ups, though nothing specific is announced in the available material.
More broadly, the account adds to a growing body of single-developer, AI-built projects that will likely be tested by others attempting similar open-ended builds — a natural check on whether one-day, no-hand-code arcade construction is reproducible or an outlier.
Key Questions
Who wrote the code for the Stickman Arcade?
According to the developer, all code was written by Claude Opus 5.5 in one day. The developer states they wrote no code and instead steered the model with questions, screenshots and repeated requests.
What is BEATDOWN?
A rhythm-based stick-figure fighting game. Every attack is judged against a live-generated soundtrack; on-beat hits deal 1.5× damage, and twelve fighters each carry four abilities for sixty in total.
How many games are in the arcade, and what platforms do they run on?
Nine games plus a stick-figure animator, for ten cards total. They run in any modern browser and on phones with touch controls, with no installation required.
Are there image or audio assets in the games?
No, according to the developer. All visuals and sound are generated by code at runtime — roughly 24,500 lines of dependency-free JavaScript, including a custom GIF encoder in the animator.
Has the one-day build claim been verified?
No. The timeline and code figures are self-reported in a single AI-assisted post that is also truncated, and no independent code review or verification has been published.
Source: Thorsten Meyer AI
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