Valve appears to have had a significant purge of its Steam marketplace, with hundreds of games removed in the last 24 hours.
The removals were first noticed when more than 980 games and soundtracks were added to Steam Tools' list of banned apps. At the time of writing, these were all banned within the last 11 hours, with the most recent removals before that being six days ago.
There appear to be no high-profile titles among them, and many of them have been available for at least three years.
At first, there was speculation about whether this was Valve's efforts to clear the Steam catalogue ahead of the expected (but not confirmed) Autumn sale later this week. However, a company spokesperson gave a different explanation to PC Gamer.
"We recently discovered a handful of partners that were abusing some Steamworks tools," Valve said. "We emailed all the affected partners."