The best mystery game ever made was released as far back as 1982, even though it may have been a little bit too hard for less avid text adventure gamers. This game was also sold in the "good ol' days" of gaming, when Infocom used to include cool "freebies" related to each game in each game box, and what's more, packaged all their games in oddly shaped packaging, related to the game inside (referred to, via eBay, as Infocom "folio" packaged games). The original release of Deadline, for example, was packaged in an artsy detective's dossier, complete with realistic documents of the crime scene, a bag of evidence (I hear this was, in fact, sweet tart candy posing as pills), and case files. As for the game, it's the best interactive mystery of all time, which may not be saying a lot these days (why so few mysteries in games?), but to say it's still the best of all mystery games since 1982 is saying enough.