Difficulties - Available difficulties start with the Quickie - lots of clues for the newbie (or when you're standing in line at the bank.) They range up to Really, Really Hard - puzzles which are just that.
A good discussion of useful techniques for solving our maximally difficult puzzles can be found at Sudopedia.
All of our puzzles have just one solution. Guessing is never required.
The Album - Sudoku X4 provides unlimited access to new and old games through an Album, accessed by the back button at the top of the puzzle screen. At the different levels, you may add and delete games, change difficulties or change puzzle types. It's easy to use - just try it!
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