A great trip down memory lane! Great puzzles! Not for people unfamiliar with the original 1993 classic.
The iPad version of the game is great, and steal at only $2.99. All but three of the puzzles remain intact. Two of them were removed because they just wouldn't work on the iPhones tiny screen. While the puzzles are styled to the game's horror theme, many of them are variations of classics you could find in many puzzle books. Some of the ones I found the most challenging include trying to place 8 Queen pieces on a chess board with out any of them taking another. Another is rearranging a series of cans with letters on them to form a sentence – except the only vowel you get is the letter Y! One could think of it as as a creepy Professor Layton game for the Nintendo DS..
The 7th Guest does show its age though. Some of the animations are a bit too fast on the iPad. I'm not sure if this by design or if the iPad is just way faster than my old PC. The pre-rendered graphics can also be a challenge to see at times. They implemented a magnifying glass zoom feature, but even still, these are some old renderings, designed for screens much lower resolution than the iPad.
Another gripe is the old school menu system. You have 10 save slots, and still have to use the Ouija Board to spell out the name of the saved game, which you never see again anyway, so not really sure the point.
Overall, the 7th Guest is a great addition to the iTunes app store! I look forward to the 11th Hour. A word of warning though, if you don't have some sentimental value towards the game, you may find the dated graphics and interfaces a bit draining. Despite the small nuisances though, I managed to beat the game in one evening – a quick trip down memory lane!