http://www.mercurymaze.com/ has released Dreams of Spirit: Fire Gate.
The best way to describe it: it's like Myst, the game from 1994.
You awake in the center room of a strange building. You must wander around to find things and solve puzzles. Hints are given freely if you keep playing.
I have not completed Fire Gate. I've been distracted with the flood of new puzzle apps.
Nevertheless, I really like Fire Gate. Solving 1 of the puzzles was particularly challenging