The question in the Quiz is the control description. To get a right answer you need to find the right sumbols. There are 3 difficulty levels depending on number of response options: easy (4), normal (6), hard (9).
Also the Quiz provides Training section.
The best score of the game goes to Records. Total points per game is a sum of points for right answers and bonus points for speed, if you give wrong answers then points are subtracted from total sum.
The Game supports Google Play Games Services (Leaderboard and Achievements).