Very challenging. One or two puzzles I sailed thru because I recognized the type of puzzle. Other than that, was very challneging.
Every so often, a phone rings and a machine comes on from the 'explorer' panicing you that he is about to arrive.
Particularly interesting or different
Yes
Things that opened in places I did not expect and the way you get out was cool too.
All the stuff you have to find and the artifacts that you discover along the way.
Very challenging. Have to be on top of your game, focus, and keep moving.
The menacing calls that come in every so often were very distracting. :)
Physically active
Not at all