The 7th Guest. Thankfully for us, modern technology lets us revisit older works via new platforms. The 7th Guest, for instance, has been available for quite some time on iOS and OS X.
But hey, maybe you – like us – have yet to purchase Trilobyte's seminal work? You'll be glad to hear, then, that the OS X and iOS versions of The 7th Guest are totally free today in celebration of May Day. We're not second-guessing it either! Free game!