UltimateSudoku - Ultimate Sudoku - is a simple to learn number-based grid game. There is no maths involved. The grid has numbers, but nothing has to add up to anything else. You solve the puzzle with reasoning and logic. It's fun. It's challenging. It's addictive! Ultimate Sudoku has over 25,000+ puzzles so you'll be busy for years. The puzzle levels range from Easy through to Fiendish. Another great game from Teazel.