This is what's wrong with your game: - It's on Android. In my experience Android apps don't monetize as well as iOS. - It's Sudoko. There are a lot of Sudoku ap

This is what's wrong with your game: - It's on Android. In my experience Android apps don't monetize as well as iOS. - It's Sudoko. There are a lot of Sudoku apps out there. - It's free. You probably need to change the pricing model. Try soem of the suggestions given in the comments above and let us know what happens.