Choose what to practice
Authored exercises and worked solutions, with AI coaching against a trusted rubric. No code runs here and no skill is certified.
Starting, hints and skips use no AI allowance. Each submitted or revised answer review uses 1 provider-backed action; failed reviews release it. Maximum 2 hints and 1 revised answer per exercise. At most one completion reward per session. Unsaved server sessions expire after 24 hours; Save keeps a private revision in History.
Temporary sessions
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