Company Duy Doan created these great apps:
Maths Game - Maths Training, English Game - Vocabulary Game, Numbers Racing, Hoc dan Guitar - Học đàn, Hoc dan Guitar - Học đàn PRO, English Grammar Quiz - Game, American History Quiz - Game, Bible Quiz - Game, Biology Quiz - Game, Chemistry Quiz - Game, English Prepositions Quiz, English Vocabulary Quiz - Game, General Knowledge Quiz - Game, Geography Quiz - Game, Greek Mythology Quiz - Game, History Quiz - Game, Islamic Quiz - Game, Kid Quiz - Game, Math Quiz - Game, Music 1980s Quiz - Game, Physics Quiz - Game, Science Quiz - Game, Soccer Quiz - Game, Spelling Quiz - Game, US Citizenship Quiz - Game, and others..
