Hey there.
I liked this game very much.
There where a bit of diffrence in the test's.
Some of them were pretty difficult. I personally had trouble with room 19 where i had to get the answer.
And i used all the free hints.
Though i will say that there is no use in the difficulties.
It is the same tests in all of them, only with the diffence of how much extra you will get in the rewards and price for help. What is the reason for increasing reward if it's not harder or has more tests?
But i liked the game very much, and it entertained me a lot. :)
I love games where you have to solve puzzels without much use of timing, without timelimit and purely focus on solving it.
i would advice others to try it out.