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A developer using the alias behind an AI-assisted blog reports that Anthropic’s Claude Opus 5.5 model built ‘BEATDOWN’, a rhythm-based stick-figure brawler, plus eight additional browser games and a stickman animator in a single day. The project, described as roughly 24,500 lines of dependency-free JavaScript, generates all art and audio in code with no image or sound files. The claim is a first-person account and has not been independently verified.

A hobbyist developer reports that Claude Opus 5.5, an AI coding model, built an entire browser-based arcade in a single day after receiving only a loose brief to create its own stickman game. According to the author’s account, the day began with one playable title and ended with BEATDOWN, a rhythm-based stick-figure brawler, headlining a Stickman Arcade of nine free games plus a stick-figure animator. The author says they wrote no code themselves and steered the model only by answering questions and sharing screenshots.

The centerpiece, BEATDOWN, is described as a brawler judged against a soundtrack generated live in the browser. On-beat hits reportedly deal 1.5× damage, and a mechanic called FOUR ON THE FLOOR rewards four consecutive on-beat hits with a bonus strike and shockwave. Enemies telegraph attacks one beat before striking, allowing timed counterattacks. According to the account, rhythm is optional — players can fight off-beat and still clear waves, but performance raises a Groove rank from MUTE to FEVER, adding musical layers as play improves.

The roster is claimed at twelve fighters, each a musical archetype such as the Drummer, DJ, Shredder and Jazz Cat. Every fighter reportedly has a passive ability, two specials, a cooldown skill and an ultimate called the DROP — sixty abilities in total. The game offers seven venues with distinct rules (a wall-less rooftop, a tilting cruise ship, a dark strobe rave), seven modes including TOUR, BOSS RUSH and local VERSUS, and a DAILY MIX seeded identically for all players each day.

The surrounding arcade adds eight games on a shared engine, including Stickman Dismount, Noir Heist, Stickman Boxing, Head Soccer and Beat Skate, several of which also use rhythm timing. A tenth card is the Stickman Animator, which the author says lets users pose figures by dragging joints, auto-generate in-between frames, and export GIFs or sprite sheets. All titles run in any browser and on phones, and share nine selectable art styles — chalkboard, riso poster, neon laser, pixel, noir and others — that redraw every visual element, not just colors. According to the author, the project contains no image or audio files: roughly 24,500 lines of plain JavaScript with zero dependencies generate every visual and sound in code, including the animator’s own GIF encoder. The games are said to collect no data, with progress stored locally in the browser.

What the One-Day Build Signals

The account matters less as a game review than as a data point in the debate over how much creative software work AI models can now complete unsupervised. The author’s central claim — that a playable brawler existed in under an hour and a ten-piece arcade by evening, with the human acting as director rather than programmer — speaks directly to questions about vibe coding, the practice of guiding AI to working software without writing code. If accurate, the project suggests that small, self-contained browser games with generated art and audio are now within reach of non-programmers in a single session.

The zero-asset approach is the other notable element. Generating all graphics, music and sound effects in code keeps the project small, dependency-free and private, and sidesteps the licensing questions that asset-based AI projects often raise. It also demonstrates that a model can hold a consistent shared design system — nine art styles applied across ten separate programs — rather than producing isolated one-off scripts.

How the Project Was Built

According to the author, the brief given to the model was deliberately open: build an original stickman game, not a clone or tutorial project. The author describes their role as steering — answering the model’s questions, sending screenshots of games they liked, and repeatedly asking for more. For the arcade itself, the AI reportedly first wrote a shared game kit and engine guide, then built the additional titles on top of that common foundation, which the author credits for the consistent art styles and controls across all ten cards.

The post carrying the account was published on a blog that discloses it was created with the assistance of artificial intelligence, and includes affiliate links to Amazon. That means both the project and the write-up involve AI generation, and the author’s description of the build process is the sole source for the timeline and technical details.

“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 author, describing the brief

Claims Not Independently Verified

Every substantive claim in this story comes from a single first-person account on an AI-assisted blog. The one-day timeline, the roughly 24,500-line codebase figure, the zero-dependency claim and the statement that the games collect no data have not been verified by independent code review. The post does not name the site hosting the arcade or provide a link in the excerpted text, so third-party playability cannot be confirmed from this material alone.

It is also unclear how much iteration occurred beyond the described process, whether any bugs or regressions were fixed by the AI or quietly revised, and how the “one day” is measured — wall-clock time versus active prompting sessions. The author’s own framing acknowledges the piece was created with AI assistance, which further limits independent sourcing.

Where the Arcade Goes From Here

The arcade is described as free and live in browsers now, so the immediate test is public play: whether the games hold up under outside users, and whether the DAILY MIX and VERSUS modes sustain repeat visits. If the author continues the pattern of “asking for more,” additional titles, fighters or venues built on the shared engine would be the natural next milestone — though none are announced in the source material.

More broadly, the account adds to a growing body of one-person, AI-built software projects. Whether such builds translate into maintained, larger applications — or remain single-session curiosities — is the open question for the vibe-coding trend this story sits within.

Key Questions

What is BEATDOWN?

According to the author, it is a stick-figure brawler in which every attack is timed against music generated live in the browser. On-beat hits deal 1.5× damage, and skilled play raises a Groove rank that adds layers to the soundtrack. Off-beat play is viable but weaker.

How many games are in the Stickman Arcade?

Nine in total — BEATDOWN plus eight others, including Stickman Dismount, Noir Heist, Stickman Boxing, Head Soccer, Beat Skate, Pose-Off, Beat Runner and Band Defense — along with a tenth card that is a stick-figure animation tool rather than a game.

Who wrote the code?

The author states that Claude Opus 5.5, an AI model, wrote all of it in one day, roughly 24,500 lines of JavaScript. The human’s role was limited to steering: answering questions and sharing reference screenshots.

Do the games work on phones?

Yes, according to the account. All titles are said to run in any browser with touch controls on phones, and progress is stored locally on the player’s device.

Are these claims verified?

No. The timeline, codebase size and technical details all come from a single first-person blog post that was itself created with AI assistance, and no independent review of the code has been reported.

Source: Thorsten Meyer AI