In O-Sudoku you should place Control Descriptions into the empty cells in such a way that in every row, column and 3×3 region each symbol appears only once.
There are 3 levels in the game.
Every level contains 50 different puzzle combinations. When new game starts – new puzzle combination is selected randomly.
The last unfinished O-Sudoku is saved and it can be continued at another time.
5 best time results for every level are saved in high scores.
The Game supports Google Play Games Services (Leaderboard and Achievements)