[jwalton]

The relevant quote:

> In the 1990s, a big part of Sega’s arcade business was selling cabinets like the Astro City that didn’t come with game boards included. Dottori-kun seems to exist primarily to provide a simple game that could be used for assessment in line with [Japan’s Electrical Appliance and Material Control Law]. It was included with the cabinet as sold (likely because the cabinet had to be in the same state as assessed for it to be valid), but was not usable for an arcade operator beyond basic testing that the game board worked, it would just be thrown away or maybe saved to be scavenged for parts.

A bit more detail here: https://www.vgfacts.com/game/dottorikun/