Vim Master is a quiz app designed to help users master the Vim editor. Available on Android, this app offers a quiz format that helps users learn Vim operations. The app has three levels of difficulty: Easy, Normal, and Hard, with a total of 150 questions.

One of the best features of this app is that it provides explanations for all the questions. Users can also browse the history of their answered results as well as those of other players. Another great feature is the ability to create and post your own questions. Moreover, users can register their name as Vim Masters for the top grades.

This app supports both English and Japanese, making it accessible to a wider audience. Overall, Vim Master is a great app for anyone who wants to learn and master Vim operations in a fun and interactive way.