Sure, Sierra's biggest adventure game titles (such as King's Quest and Space Quest) have been around in their original forms on Steam for a while, but many gamers remember playing a lot more than that. What about arresting perps in Police Quest, or saving the day in Quest for Glory (aka Hero's Quest)? You're set from now on. Sierra and Activision have released a wave of further classics on Steam, including the Police Quest Collection, the original Gabriel Knight trilogy and the two Phantasmagoria games. You'll get a handful of non-adventure titles published under Sierra's wing, too, such as Arcanum and Caesar 4.