Grammatik Odyssee: GM Edition - Seeking Testers for Closed Beta

Seeking 20 testers for a closed Google Play beta of 'Grammatik Odyssee: GM Edition' for at least 14 days. Participate in a 1:1 test exchange: test this app, and the developer will test your app in return. To join, please join the Google Group, register as a tester via the provided web link, and download the app from the Play Store.