I write SQL for a living, and last year I got tired of tutorial hell  and brushing up for interviews that teach SELECT on toy tables and then abandon you. So I spent a few months building the course I wished existed, and then, because studying alone is miserable, I wrapped it in a visual novel.

TsundereSQL is a full SQL course - 212 problems across 14 modules, from your first SELECT through joins, window functions, and the kind of production-data only prod dbs have (definitely not stolen).  A real database (DuckDB) runs entirely in your browser and grades the queries you actually write against hidden tests. Your instructor teaches, roasts your mistakes, and slowly warms up as you improve. There's a full story with more instructors to meet if you stick with it.

Free, browser-only, no account: https://tsunderesql.itch.io/tsunderesql

It launched today. I'd love to hear what everyone thinks.