Yes, Spiidoku Sudoku 6x6 is completely free and it doesn't have any in-app purchases or subscriptions.
Not enough reviews to make a reliable assessment. The app needs more user feedback.
Spiidoku Sudoku 6x6 is free.
To get estimated revenue of Spiidoku Sudoku 6x6 app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.