If you’ve got an itch that a single, newspaper-bound Sudoku puzzle each day just can’t satisfy, then Go! Sudoku is your cure. That or a good, sturdy back-scratcher.
Go! Sudoku is a collection of approximately 1000 different Sudoku puzzles across an array of different difficulty levels, as a competitive or cooperative multiplayer game, or as a single-player time challenge. As a bonus, there are even more puzzles available for download, though the interface to get to them is pretty clunky.