jSudoku is a Sudoku Logical Number Puzzle game written in JAVA -
no longer working on JAVA 7 for Mac OS X 10.9 and beyond ... This is the Sudoku board game. The game is written is Java and thus requires Java Virtual Machine installed - Avalilable for all OSs. The game creates an initial Sudoku board and later checks the player's solution.
http://jsudoku.sourceforge.net/