ShortEditor

BugGym (buggym.vercel.app) is a live product for practicing debugging AI-generated code: 74 problems in Python, JavaScript, Java and C plus multi-file Labs, all graded by hidden tests on the server. The platform predates the hackathon; entering Startups track. New during the hackathon (Nov 4): Muse Fix Review. When your fix fails the grading, Meta's open-weight Muse Spark Open model (via Baseten) explains why: concrete reasons tied to your code, an on-track/off-track verdict, one takeaway. The model sees only what you already see - public task, buggy code, your attempt, failed check names. Hidden tests and solutions never leave the server; deterministic grading stays the source of truth. The linked public repo contains exactly this new feature; the product codebase remains private.