Sudoku is a classic puzzle game for Android developed by Foggy.Link and available for free. The game is based on a logic-based number-placement puzzle where the objective is to fill a 9x9 grid with digits so that each column, each row, and each of the nine 3x3 sub-grids contains all the digits from 1 to 9. The puzzle setter provides a partially completed grid for the player to complete.

The game is easy to understand but challenging to master, making it a great way to pass the time. Sudoku offers multiple difficulty levels, ranging from easy to hard, and features an auto-check feature that highlights any incorrect entries. The game also provides an undo and redo option, making it simple to correct any mistakes. Overall, Sudoku is a great puzzle game for anyone looking to exercise their logical thinking skills.