Sudoku Ultimate is a free Android game developed by OperationMedia. It is a board game that offers an infinite number of Sudokus to access. With six levels of difficulty, it caters to beginners, advanced learners, and experts. The game also allows players to change the symbol set and play Sudokus with letters, shapes, or colors.

Sudoku Ultimate provides players with a range of features that make the game more engaging. These include hints to view when players get stuck, note-making with a virtual pencil, and the ability to choose different designs. The game is optimized for both phone and tablet use, and it supports five languages - English, German, French, Bulgarian, and Russian. Players can also play with numbers, letters, shapes, colors, and 20 additional symbol sets.

Sudoku Ultimate is an excellent game for anyone who loves solving puzzles. With its easy-to-use interface, multiple features, and the ability to customize the game to one's preferences, it is an enjoyable way to pass the time.