I tried just repeating guó for as many times as symbols and repetition was not recognized.

Although I like the active aspect of the approach. Language apps where sound is the main form of learning should have a great advantage, as any written text just confuses as every country has its own spin on orthography. Even pinyin, despite making sense, for a beginner, has so many conflicting symbols.

> I tried just repeating guó for as many times as symbols and repetition was not recognized.

Can you elaborate? I'm not sure I understand.