Query a company operations database, build executive-ready reports, master window functions, investigate data quality issues, and learn to think like a BI analyst who never ships a wrong number.
25 missions · runs entirely in your browser · no account needed
Read the briefing
A Slack message from your manager
Explore the schema
5 tables in a star schema
Write your query
Full SQL editor with autocomplete
Get expert feedback
Graduated hints, not just pass/fail
Answer questions from the CFO, VP of Sales, Head of Product, CEO, and department leads — each with different expectations.
Trailing spaces, ghost regions, inactive employees, and category casing issues that break dashboards.
Window functions, YoY comparisons, moving averages, cohort analysis, self-joins, correlated subqueries, and full data audits.
Every mission maps to a real BI analyst task — board decks, QBRs, data audits, and executive requests you’ll see on the job.
Each mission is a real request from someone at the company. Difficulty increases as you go.
A company operations star schema with 5 tables, 2,700+ rows, and 10 planted data quality issues. Trailing spaces that create phantom products, ghost regions that vanish from INNER JOINs, inactive employees inflating performance reports, and more.
●dimension tables ● fact tables
The dashboard numbers are wrong and she wants to know why.
Looking for something different?