Fixed a bug that text is mungled on some phones.
Update billing library.
This app was created in order to master the operation of vim editor.
You can learn a vim operations in quiz format.
There are three types of difficulty, Easy, Normal, and Hard.
There are 150 questions in total.
There are explanations for all questions.
You can browse the history of the answered results of yours and other players.
You can create your own question and post it.
You can register your name as Vim Masters for the top grades.
This app supports English and Japanese.
