My experience as an adventure game player goes way back to the text-only Colossal Cave game, which then morphed into the classic Zork text games from Infocom (which, by the way, you can play even now on iOS with the Lost Treasures of Infocom app).
Now, with speed and graphic power, games are a lot more immersive and fun to play. Tipping Point Adventure, is a recent iPad-only release that is rich in puzzles and high quality graphics. The game is currently on sale for U.S. $1.99 in the app store. Y