Dark and Darker has been pulled off Steam – where it was currently in playtests – following the ongoing battle between developer Ironmace and publisher Nexon.
As reported by RPS, Ironmace received a cease and desist and DMCA takedown from Nexon. The developer posted a message on its Discord explaining this is all based on "distorted claims."
In the DMCA, which was shared on Dark and Darker's subreddit, Nexon said that Ironmace "is making unauthorised use of Nexon's trade secrets and copyrighted material."
source https://www.gamesindustry.biz/dark-and-darker-removed-from-steam-due-to-ongoing-ironmacenexon-dispute