In the early '90s, one of the premier PC games was 7th Guest. It was the first game to use full rendered 3D animation and navigation, and Bill Gates called it "the new standard in interactive entertainment". Trilobyte, the company that made 7th Guest and its sequel, The 11th Hour, eventually went out of business.

However, some members of the original Trilobyte team have ported The 7th Guest to iPhone and iPad, as well as the Mac App Store. For May Day, Trilobyte is offering both the iOS and Mac versions of their games for free, down from $4.99 and $9.99. Also free is 7th Guest: Infection, a specially rebuilt puzzle built for the iPad.

"Welcome to my ... house!" Old Man Stauf built a house and filled it with his toys. Six guests were invited one night, their screams the only noise… In the world of The 7th Guest, you are an active and mysterious entity known only as "Ego". Your role, identity and purpose is not known or explained, rather, it is experienced as a seamlessly integral part of the total environment that is the Stauf mansion. Because you are looking out from within, you cannot see yourself, but your inner spirit has a voice. Listen to it. The house of The 7th Guest is filled with 19 devilishly clever puzzles that will test your wits and scare you out of them as well. To complete the game you must solve every puzzle in the house - only then will the secrets of the madman Henry Stauf be revealed to you.

The 7th Guest is available as both a universal iOS app (normally $4.99, Direct Link) and on the Mac App Store (normally $9.99, Direct Link).

The 7th Guest: Infection is available for the iPad, normally $2.99. [Direct Link]