The Countdown Project That Became 19 Games: My AI Coding Experience

🔍 Read the full analysis: The Countdown Project That Became 19 Games: My AI Coding Experience on ThorstenMeyerAI.com

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Thorsten Meyer says he and AI coding agent Claude Opus 5.5 turned a request for a one-minute animated countdown film into a public web app in five days, including a daily workday counter, a narrated film and 19 3D games. Meyer published his account on October 13, describing the project as a collaboration in which the agent handled much of the implementation while he set the direction, made decisions and approved releases.

The project, called Altersteilzeit, is designed for people in Germany using the block model of partial retirement: a period of regular work followed by an equally long period away from work. Users enter a date and choose a model, from 1:1 to 5:5. Meyer says the app calculates the other phase and counts working days, accounting for weekdays, public holidays in the selected German state and entered leave.

Meyer describes three main experiences built around those dates: a daily countdown with milestones and a saying of the day; a short film depicting the working and time-off phases; and a game collection that turns years of the active phase into levels. The site also includes a team countdown, a bridge-day finder, badges and calendar features. The source account gives different game counts in different passages: it calls the collection 19 games, but describes a game with 15 modes. The relationship between those figures is not explained.

According to Meyer, the five-day build ran from Monday, Sept. 28, to Friday, Oct. 2. The work included adding language options, narration, sound effects and fixes for mobile scrolling. He says the app has seven languages and five German dialects, while a separate production tally describes 12 languages for text and audio. Meyer reports 24 commits co-authored by the agent, roughly 18,000 lines of JavaScript and Python, 15 test scripts and 1,224 voice clips. Those figures are from his project account and have not been independently verified.

What the Five-Day Build Shows

The project offers a concrete account of how an AI coding agent was used across a small software release, from feature implementation and tests to translation work, audio production and deployment. Its reported scope is broader than a single generated program: Meyer says the agent worked from successive instructions, wrote plans, logged changes and tested features, while he reviewed the results.

For readers evaluating claims about AI-assisted development, the division of work is as relevant as the speed. Meyer says the agent produced much of the technical material, but he retained responsibility for the concept, tone, feature choices and final approval. That account points to a practical distinction: generating and integrating code did not remove the need for a person to decide what the product should be and whether it was ready to publish.

The app also applies a specific design idea: mapping real calendar time onto game mechanics. Meyer says months, weeks, workdays and holidays shape levels and rules, so a countdown is not just a number displayed beside unrelated games. Whether that approach is useful or enjoyable to users is not established by the account, which does not provide user numbers or feedback.

From Film Request to Countdown App

Altersteilzeit is a partial-retirement arrangement. In the block model described by Meyer, a person works as usual during an active phase and is then released from work during a passive phase; a 4:4 model, for example, means four years in each phase. The app’s stated purpose is to make that period easier to track and to give users interactive ways to mark progress.

Meyer says his original request on Sept. 28 was for a short animated film counting down the working days in such an arrangement. The project expanded through daily feature additions, and he says the public site was online by the first evening. By Oct. 2, he had approved the release and added German dialect options. The account was published by Meyer on ThorstenMeyerAI.com on Oct. 13, 2026.

Privacy is described as a design rule: Meyer says the app has no accounts, cookies or tracking, and calculations happen in the browser. He also says shared dates are stored after the “#” in a web address, which browsers do not send to a server. The source does not provide an independent privacy review or technical documentation to verify those statements.

“The interesting part is not how much an AI agent can build, but what was still left for me to do.”

— Thorsten Meyer, describing the project’s division of work

Unverified Counts and User Response

The project figures, development timeline and descriptions of the agent’s contributions come from Meyer’s account; no independent technical audit, repository review or test results are included in the supplied material. It is not clear how much code or production work required correction, how the agent’s output was evaluated, or whether the reported test scripts cover the published app’s full functionality.

Some details need clarification. Meyer describes a 19-game collection but also refers to 15 game modes, without explaining whether modes are grouped within games. He reports seven languages and five dialects for the app, and separately says the agent produced text and audio in 12 languages. The account does not specify how those totals relate. It also gives no download or visitor figures, user feedback, or evidence about the app’s longer-term maintenance and accessibility.

The App After Its Launch

Meyer’s account ends with the app’s release and his approval of the final additions; it does not announce a next release date or a planned feature. The immediate next step for readers is to assess the public app itself, including its date calculations, language options, privacy behavior and game collection.

Any broader conclusion about the speed or reliability of AI-assisted software development will depend on evidence beyond this account, such as independent inspection of the code, the project’s maintenance history and feedback from people using the app. Meyer has not provided a timeline for those developments in the source material.

Key Questions

What is the Altersteilzeit app?

It is a web app for tracking the working days remaining in a German partial-retirement arrangement using the block model. Meyer says it combines a countdown, milestones, a narrated film and games tied to the user’s dates.

How long did the project take?

Meyer says work began on Sept. 28, 2026, with a request for a short animated film, and the expanded site was approved and released on Oct. 2.

What did the AI coding agent do?

According to Meyer, Claude Opus 5.5 helped build and test features, handle language and audio work, and support deployment. Meyer says he set the direction, made product decisions, reviewed outputs and approved releases.

Is the app’s privacy approach independently verified?

No independent review is cited in Meyer’s account. He says the app has no accounts, cookies or tracking, performs calculations in the browser and places shared dates after the “#” in the URL.

Why do the game totals differ in the account?

The account calls the collection 19 games but also says the game was playable in 15 modes. It does not explain whether those are separate counts for games and modes or otherwise reconcile them.

Source: ThorstenMeyerAI.com