The back button now works. Glad the developer fixed that. However, after the update I am experiencing the frame rate lag issue. Inside the app the frame rate stutters/lags whenever I click anything. If the developer fixes this issue too; I will give 5 stars.
Wonderful system of learning. Works very well in a very efficient manner. The only thing it is missing is your effort! Get to work and learn something new! 5*****
Spammers!! They immediately began sending spam with no UNSUBSCRIBE option. Save yourself. Avoid.
Not free. Charges you for what other apps provide freely. No free trial either. You can't add images / sounds without paying.