Object: support a human in solving Sudoku puzzles.

This tool does not automatically create Sudoku puzzles. Nor does it (usually) fully solve a Sudoku puzzle automatically.
It is, however, a very useful tool for you when you try to solve such a puzzle because it takes out up to 90 percent of the drudgery and the boring bits.

First copy the Sudoku puzzle to the given board.
The large yellow positions of the board will contain the standard Sudoku digits 1,...,9.
These large digits come in two colours, black and dark green.
Black digits are the given digits; green digits are the ones you (or the computer) figured out. (This is only a suggestion, though; you may use only black large digits or only green large digits, if you so wish). If you placed a wrong entry, undo your move.

Board setup:
Click a black digit at the right border to mark a digit, then click a yellow board position to set up a Sudoku puzzle.

Candidates:
The small digits indicate possible candidates for this position.
At the start of the game, all digits 1 to 9 are candidates for each position.
Click a small digit to make it disappear, signalling that this value has been excluded.

Help Options:
'NONE': The system only deletes the candidates of the position where you enter a solution (large green or black digit on a yellow position).
'SOME': When you enter a large green or black digit on a yellow position, the system will automatically delete all corresponding candidates (small fonts) in the same row, column or 3x3 square.
'MORE': In addition to the above, the system will after each move search for solitary candidates, since those candidates are indeed part of the Sudoku solution. The system will then delete the (small font) candidate and create a large green digit at the associated yellow position. Since this editing can lead to other opportunities to delete candidates in the same row or colum, the system sometimes does many rounds (without human interference) until it cannot improve the situation anymore. Furthermore, 'ALL' will check for empty positions, which can occur after the system's calculations if you guessed a wrong digit in the first place. In this case an error mesage will be displayed at the right border, and the empty position will be highlighted. Undo the last move(s) and make a better guess.
'ALL': In addition to the above, the system will check (for each row or file) if there is a small digit wich occurs only once. This digit then will be converted to a large green digit, which becomes part of the solution.

In easy Sudoku puzzles this Zillions tool (with HELP=ALL) might do up to 90% or even all of the work!
The author has even solved hard cases in a few minutes with this tool.
(Save an intermediate solving-state to a zsg file and then try out a few lines of progress).

You get a win message if each row, column and 3x3 square contains 9 different (large font) digits.

Please note that there are several additional piece sets available (View/SwitchPieceSet.