Sudoku-321

Sep 24, 2018

-- Passing mode, with different difficulty Sudoku models, the level of difficulty is gradual.
-- Challenge mode, update the question bank every hour.
-- Online mode, you can play against other players at the same time.
-- Online ranking, ranking records for each Sudoku mode
-- Recording function, recording the process of filling in Sudoku, can be withdrawn, restored, and verified at any time.