This game is content-rich, with 3000+ "no brainer" questions, in each language, split into 31 categories, and 50 levels varying in length, first few you will have to answer 4 sets of 5 questions (20 total) in order to proceed, ending with having 20 sets of 5 questions (100 total) to win.
The idea, you will not know how difficult it is for you to answer a no-brainer, yes or no question, when you have to do that 30 times in a raw (with a window of 3 seconds for each question) no matter how good you are. To add some fun to the stress, each answer you give incorrectly will give you a funny comment specifically tailored to that wrong answer (again content-rich).
The balancing of the levels, difficultly, even introduction of content (so that you will always feel there is something new) was extensive. You compete with friends on Facebook on a level selector (like the one in Candy Crush) with more levels to be introduced later (along with more game play mechanics).