"Something sinister happens every night in a cursed mansion in Vienna. Some years have passed since the second plague epidemic, and you are the only descendant of the Malstrum's family who will dare enter the mansion, and discover what happened in that haunted place." Malstrum's Mansion is a free, browser-based adventure game inspired by Shadowgate and the other "MacVenture" games by ICOM Simulations. Developed by ACE Team, it was originally drawn and designed in 1989 for a Mac Plus, but it didn't see the light until April 2009, when it was created as a free flash game. The game also serves as a bit of viral marketing for the team's first commercial game, Zeno Clash.