Problems
Response from developer
I'm sorry you had a problem. The app contains 100 paintings, all of which should also appear in the questions. Note, however, that the app uses spaced repetition, meaning it repeats questions if it thinks you might otherwise forget the answers. (The number in the right box is greater than 0 in this case.) So initially, paintings may appear repeatedly, but over time they should all appear. Please try to see if your problem persists with the latest version.