Dracosoft has released
Christmas Sudoku, a seasonal variation on the popular Sudoku number puzzle game. It costs $5.99.
Christmas Sudoku replaces the original numbers found in normal Sudoku puzzles with Christmas-themed icons instead: Santa, bells, snowflakes, gingerbread men, candles, presents and other items.
Christmas Sudoku requires Mac OS X v10.3 or later. A demo download is available.