When you start Secret Files: Tunguska, you will notice several things, but what stands out immediately is the voice acting, being at the best of times, tiresome, somewhat embarrassing and even downright abysmal. To be fair, a few good actors do a good job, but between the unusual “never use contractions” thing, the odd phrasing and peculiar word choice, the “breaking of the fourth-wall” and the main characters voice choice being all over the place in terms of quality, you’d have a hard time bringing yourself to finishing the game.
Puzzles were regularly the “combine some items” types which are generally a staple for any self-proclaimed adventure game, but they were about as contrived as “puzzle” of this type can get. Before long, you would be sick to death of guessing which inane impromptu tool you are supposed to make from the items in your inventory.
So by finally finishing the game, you would see the extent of its dull, inane, meandering story; hear your fair share of sub-standard voice acting; you’d enjoy plenty of robotic animations; you’d play your fair share of 'hunt for the pixels that you can click on to find an item as you would assume was there more times than you’d liked; and you had gone through puzzles that, had if you had played the game organically, probably would have meant resorting to systematically trying to combine everything in my inventory until you stumbled across the right pairing.
I wouldn't recommend this game to anyone unless they'd run out of other adventure games to play and needed one that would probably would have taken them a long time to get through.