In this application You can play a popular 9 x 9 puzzle game sudoku. No matter if You are a beginner or an experienced sudoku player, this application will provide a great amount of entertainment for You. It differentiates between four levels of game levels: easy, medium, hard and extreme. The application has all the features a sudoku player can wish for such as show/hide possible candidates for each cell, automatic recalculation of candidates on the fly or working with candidates by hand, highlighting cells with certain candidate value to easily spot a pattern like X-Wing or similar.