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Your current navigation and account state stay available while the next page loads.
Open the complete system-design simulator or trace a bounded retry-overload exercise.
Run a deterministic queue-pressure scenario, inspect every request transition, and verify the safety invariants. No external service, model, GPU, or persistent storage is used.
The simulator downloads only after you start it. Results stay in this page and are released when you leave.
Runs stay in your browser and end when you leave the page. No account, saved progress, cloud resource, or private practice data is attached to this lab.