Erasing: Use the Undo button to undo the last action.Hold down the Control key to make the basic grades into Very Easy, Anonymous and Very Hard respectively. Puzzle grades: Basic grades are Easy, Medium and Hard.Allow or disallow pencilmarks for each grade of puzzle. Select one of 3 different modes of ordering and positioning pencilmarks (Auto re-order, Append or Freestyle). Allow up to 4 pencilmarks per cell (2 x 2) or 9 per cell (3 x 3). The same action erases an already-present pencilmark. Pencilmarks: Enter pencilmarks with the right mouse-button (mouse) or with the Control key down (keyboard).

Switch freely between the two (between puzzles or mid-puzzle). Selection is confirmed on the number-toolbar.

Selecting number to enter: Four different methods: click a button on the number-toolbar, click any number appearing in the grid, use the keyboard, or rotate a mouse-wheel.

For the undaunted, these are no-hype notes about the program's features! Sudoku is jam-packed with features to make solving Sudoku puzzles easier and more fun. The program does not copy puzzles from a built-in preset library of puzzles.

Original, because each puzzle is built from scratch, on demand.

Although (in theory) there could be a coincidence of astronomic proportions, if it happened you should buy a ticket in the lottery. You are the first person to ever set eyes on each puzzle.

Unique, because every puzzle is different.

There's no predictable, repetitive style.

Random, because the program does not play favorites with numbers and patterns, the way a human setter tends to do.

It's not like some programs where you get 20 or 30 puzzles and then the program is all used-up and useless.

Endless, because every time you click the New button, you get a new puzzle.

The program gives you an endless supply of random, unique, original Sudoku puzzles.

They are all Microsoft's own updates to Windows, and may include an XML service pack, an MDAC service pack, and an updated version of Windows Installer. If they are not installed on your computer already, the Sudoku setup program will install them for you. It will not work under Mac OS X, even with virtualisation software like Virtual PC. It will work on Intel-based Macintoshes only if they are running Windows using Apple's Boot Camp software. It works on Windows 98, NT 4.0, 2000, Me, XP, Vista and 7.

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