3.1.1
2020-05-05
Technical update for iOS 13
3.1
2019-03-23
Minor bug fixes.
3.0
2018-07-18
Introduces difficulty level selection
180 questions (instead of 150)
2.5
2017-09-27
Technical adaptations for iOS 11
2.0
2017-04-20
Study mode (new feature): In study mode each question is accompanied by a hint and an option to show the correct answer. Hints explain how the diagram changes within the sequence. You can also retry a question if you do not answer it correctly. Once you find all correct answers you have the option to redo the test with the same questions at which point answers are reshuffled.
1.5
2017-02-28
Correct answers are shown at the end of each test. Swipe left / right to skip answered questions.