Sudoko (April 24th, 2011) Found this excellent version of Sudoku for the Commodore 64.  It has a really nice, clean, simple interface and looks amazing.  The following is a quote from the originating website:

Among the most popular puzzles nowadays is Sudoku. If we look into history, we find that the author of the game is Howard Garns, who published it in 1979 under the original name Number place. However, the game gained the most popularity in Japan, where it was also given the current name Sudoku. It is an abbreviation of the original name "SUuji wa DOKUshin ni kagiru", which loosely translated into Czech means "End every single number into a defined space". We will not describe the rules here, surely everyone knows them well. In the game you have a choice of four difficulty (easy, medium, hard and extreme) and to whom it is not enough, so you can use the built-in editor and create your own initial insert of the puzzle. And one more surprise at the end, because it's Easter, so we hid two eggs for you in the game. Will you find them?