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Circle or scribble on the screenshot, pick what's wrong, add a note.
The question, your answer and the build are attached automatically.
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News and updates on our Discord A math mastery tool.Each Check sends your writing to Claude on your own API key. This caps what one Check can cost.
Having trouble getting your handwriting read? Try a higher setting.
Select (the box tool, or the S key) lets you box only your answer, or the part you want graded. That reads better and costs less than sending the whole page.
Exposure is the principal component of mastery. Here, I've removed your roadblocks. To the incoming Golden Age of the internet!Abel Minded
© 2026 Abel Minded. All rights reserved, except the open-source software below, which keeps its own license. The game, its code, questions, solutions, tips, art and music may not be copied, re-hosted, scraped or reverse engineered. Read the Terms of Use.
Math is drawn with KaTeX (MIT license), the game runs in your browser with Pyodide (MPL 2.0), and report screenshots use html2canvas (MIT license). Handwriting is read by Claude, from Anthropic, using your own API key.
Your progress stays in your browser, and nothing about you is sent unless you send it. Read the privacy page.
The songs on the Ocean tab are made live in your browser by the game itself (no recordings), © 2026 Abel Minded.