Pro:
You can always save. The graph (similar to Resident Evil DS) is really nice for DS conditions. I like the realistic style very well. In addition, the game has an audio output and German voice actors.
Power of deduction is required. You must already look exactly everywhere and fiddling to solve puzzles. For this you need to find objects and combine them to get ahead. This one should be very very inventive, because some combinations are really tricky.
The DS implementation works just fine. Through a magnifying glass function via a stylus is hidden no more important subject or Note.
The story is not bad, at least understandable and not contrived by the hair. It forms the guide of the game. While Nina is looking about her supposedly kidnapped father visited various places such as Germany, Russia, Cuba, etc. in length to the game is okay. (It could have been a little longer, especially if you know the solutions goes very quickly; most of the time you spend with puzzling because one does not get further; D)
Cons:
The possible combinations are sometimes so complicated and far-fetched that one comes only by trial and error on the dull solution. I've played through the game without help, but many times I have very very long herumprobiert then to come by chance on the solution. Here I am missing a few little personal notes, so you stand not entirely stupid. The solution, of course you want to not get spoon-fed, but at least you should be able to understand it alone come without combining frustrated nonsensical objects together.
The game has no counterplay value. If you know the solutions, it is rather boring and you can not earn several times playthrough.
The story of the game is quite serious spiced with ner lot of humor. However, Nina's comments have annoyed me after a short time because the jokes are simply too flat and therefore as a snippy bitch comes across the drags on everything and everyone.
The punch lines and click is a bit monotonous after a while. A bit more variety here I lack in between such as the Safe puzzle. In additional DS features was unfortunately omitted.
But well the whole it makes in spite of all fun to play Secret Files: Tunguska. I do not regret the purchase anyway.
I think I can do it all recommend point & click Adventures like and what to look for in between for brainstorming.