One Sudoku - one day, one sudoku

Best cities

1. Pyongyang 3
2. Hamhung 0
3. Hungnam 0
4. Kaesong 0
5. Wonsan 0
6. Chongjin 0
7. Sinuiju 0
8. Haeju 0
9. Kanggye 0

Best players

1. chang_jee_youn 0
2. biaoo 0
3. kimjungil -11