Thank you for your reply. I've solved problem when I used Web-interface of Parental Control (before I tried on children's tablet). So, green thumb-up for the application via https://parentalcontrol.eset.com/Rules + tablet soft reset is the solution.
Hello. Parental Control recognize Einstein™ Brain Trainer HD https://play.google.com/store/apps/details?id=de.bbg.EinsteinHD like GAME. Even if I set manually it like "Appropriate" (green thumb-up), Parental Control not allow to start Einstein™ Brain Trainer (I set game time limit also). Could anybody advise me the solution, pls?