Jérôme Lulling has put online a number of materials for learning Luxembourgish. One of them are on LearningApps.org platform: http://www.exercice.lu (redirects here).

Games/quizzes are split in categories

Different type of games

The Millionaire game
Conditionnel passé mat hätt (B2.1)
Kleeder: Fannt d'Wuert ! (A2.1)

And many more...