Go beyond isolated SQL exercises with 24 business-analysis missions using fictional data. Practise joins, metrics, cohorts and reconciliation in read-only SQLite, with hints and result checks across three datasets. Finish by exporting an HTML report with your query, results and written findings. Runs locally with Python 3.11+ and a desktop browser. Includes solutions, an English guide and progress backup. USD 7 once; no accounts, API keys or subscriptions.