Irodoku is Sudoku with colors and symbols. It features 25 Levels, each with a different color palette or set of symbols. It is 100% free and you can play it directly in Browser. A download version will be available as well, soon. This is the Betaversion. I´m planning to finish the game in the next very few days. If you have any comments, critics or suggestions please let me know.
Here the link to the game: