Master debugging through authentic bugs from open-source history. Learn the patterns, understand the context, build the skills that matter.
Real bugs, real context, real learning outcomes
Debug actual bugs from open-source projects. Not contrived examples—authentic issues that affected real users.
Safe Docker environments for each challenge. Experiment freely without breaking anything.
Socratic guidance that teaches debugging methodology. Learn to think like a debugger, not just fix bugs.
Understand why bugs happened. Learn about the constraints, patterns, and pressures that led to each issue.
Challenges across JavaScript, Python, Go, Rust, C#, and more. Build versatile debugging skills.
Earn achievements, unlock harder challenges, and build a portfolio of solved bugs.
The platform is under active development.