Show HN: I made a SQL game to help people learn / challenge their skills 3 years ago
Came here to post this, as well. It frustrated me for a few tries until I looked closer at what was actually in the data. Maybe it's meant to teach players to look at the data more critically. ;) Also noted that the "Learn" section on this chapter seems to end prematurely.
Other than this frustration, it's been fun so far!