For all opera fans! Demonstrate your knowledge of the 50 most performed operas by the most important opera composers. The app has 2 game levels:
* guessing the opera from its poster: Carmen by Georges Bizet or Turandot by Giacomo Puccini?
* guessing the composer from the portrait: Richard Wagner or Giuseppe Verdi?
* Italian (The Barber of Seville), German (The Flying Dutchman), French (The Tales of Hoffmann), and Russian (Eugene Onegin) operas
Choose the game mode:
* Spelling quizzes
* Multiple-choice questions
- Many new features (stars) and improvements in game mechanics.
InstaSun — time-lapse sunsets! 
IKnowMyWay 
Functional Groups in Chemistry 