RussianGuru

By default, EyeTwenty is set to 20-20-20 rule, which suggests that after every 20 minutes, you should take a break for at least 20 seconds.

Starting from v2.0.0 you can extend the default 20-20-20 rule, and set your own, custom break interval, break duration and message which suits you most!

With RussianGuru you can master the Russian cases by quizzing yourself on accusative, dative, genitive, prepositional, and instrumental cases.