I've tried a lot of escape/puzzle games but I've not seen an ongoing story like this. Each game is a chapter of a larger story, but are each self contained games.
The story is very engaging and it gets daaaark.
The codes and such are inputted to a website rather than an app, which is a lot better to me. The downside of this is the hints are not searchable and instead the hint button only gives you info on what the designers thought was your next puzzle.
FAQ - no elements are damaged, marked, or destroyed so it can be easily reset. It's a deck of about 50 cards so just put them back in order. There is an unique code for the website and it allows 50 plays.
This is a great deal for so much play.