Su Doku puzzles are quite simple crossword like puzzles. The puzzle consists of a partially filled in 9x9 grid divided up into nine 3x3 groupings where the goal is to fill in the blank squares with the digits 1-9 such that no column, row or 3x3 grouping contains more than a single occurrence of each digit. Su Doku Master allows you to enter your own puzzles, work with some preloaded puzzles or generate new puzzles of varying degrees of difficulty. You can then print out the puzzles if you want to work on them by hand.
