Sudoku 1024 - Super hard

I'm a Sudoku lover, I always want to play Sudoku whenever I have time. But all of the Sudoku apps on Android are not very good, both free or not free. Most of them are too easy, some hijack ads banner too much, some have a bad UI and UX. So, I decided to make one for me and for everyone who love Sudoku like me. I made it free, beautiful UI, good UX, and the real Sudoku puzzles. - Totally FREE. Sudoku is free, so, let's play it free. - 4 levels of difficulty. - 1024 puzzles per level (4096 in total). - Start with easy, but easy does not mean simple. - No Ads will disturb you while playing. - Let's play and experience the REAL challenges. WARNING: This is not a simple game. You should be absolutely patient while playing this game. "I love playing Sudoku, that is why I make this game. Playing Sudoku really helps me improve my memory and concentration and I would like to share my experience." - Tuan Chau Bug or any suggestion, post it on this Facebook Fan Page: https://www.facebook.com/sudoku1024