This app is a personal, non-commercial project. It does not use analytics, advertising or any third-party tracking services.
This app is operated by cornshakes (the "controller" under GDPR). You can reach the controller by email.
When you sign in with GitHub, This app stores:
While you use the app, it also stores your challenge solutions, their version history and submission timestamps.
Your GitHub handle, avatar, number of challenges solved and most recent solve time are shown to other signed-in players on the leaderboard. Other signed-in players can also open your full stats page from there — your rank, solved count, total and fastest solve time, and a per-language breakdown. If you tick "Share my stats page", that same page becomes readable by anyone with the link, at /u/<your handle>, without signing in. Unticking the box takes the page offline again immediately, and the page is excluded from search engine indexing either way.
This app sets one strictly-necessary cookie, better-auth.session_token, which keeps you signed in. It expires after 7 days. One additional short-lived cookie has to be used during the GitHub sign in process. Nothing else is set, and nothing is shared with third parties for advertising or tracking purposes.
GitHub is used for sign-in and to serve your avatar image. There are no analytics or advertising services. The app is hosted on a server located in Austria.
Your data is kept for as long as your account exists. Deleting your account removes all your data immediately. To delete your account, click .
© 2026 cornshakes. All rights reserved. The app, its design, its text and the challenge content are the work of the operator and may not be copied, redistributed or published elsewhere without permission. Trademarks and names of third-party languages, tools and services belong to their respective owners.
The code you write while solving challenges stays yours. Submitting it only grants the operator permission to store and run it for the purpose of checking your solutions and showing them back to you.