
SudokuHelp+ is everything SudokuHelp was PLUS:  
84 Classified & Rated Puzzles personally crafted by Greg Shalless. Includes 2 new puzzles in Version 1.3 to highlight a recently added Solving Rule, namely Pair Chains and another 3 puzzles to highlight the even more recently added Single Value Chains Solving Rule, now available in Version 1.4. Version 2.0 adds the absolute killer Solving Rule, Multi Value Chains, which solves the No. 77 puzzle that the SudokuHelpPlus solver was not previously able to solve, and adds a few puzzles that show the full potential of that new rule. And now with Version 2.1 a special one click button has been added to enable you to Paste in any of the free Puzzles previously published in mX Newspaper (and available online exclusively here at mX Sudoku Puzzle history). NEW in SudokuHelp+ Version 3.0:  Much more powerful SingleValueChains rule.  All new feature to highlight the last Elimination.  The special "Paste mX Puzzle" button will now paste puzzles in the following format: 6.8..4... ...51.49. .51..9... 1.......5 .659.178. 8.......1 ...8..56. .76.52... ...1..3.7  A brand new SHD Ratings algorithm.  A complete history Log of every Elimination performed by the SudokuHelp+Solver.  3 Brand new Puzzles: No 82  A MultiValueChains monster with a 238 SHD No 83  To highlight the new SingleValueChains code No 84  A "Master" class puzzle that could not be solved by Version 2.4 but can be solved with the Master Class rule "Blocked Gridlock". However the new SingleValueChains code eats this puzzle for breakfast  so it's not "Master" class after all. 

The ability to Convert any Numeric Sudoku puzzle to another Numeric or for that matter Alphabetic Sudoku Puzzle.  
The ability to Transform any Sudoku puzzle by any one of eight transformations that preserve the puzzle, both in its 180^{o} rotational symmetry and so that it is in effect identical to solve, but which make it look completely different .  
A number of Cluedoku Puzzles which are Alphabetic Sudoku Puzzles where there is more than one solution. You must solve the Clue (the answer is hidden in the puzzle) to find the right one.  
The SudokuHelp+Solver which implements a number of Sudoku Solving Rules. It does not solve the puzzle other than as directed by you, where you click the appropriate button to execute that Rule across the puzzle. You can do this with Looping On (it keeps going till nothing more can be done with that Rule) or with Looping Off. It is intended that the SudokuHelp+Solver will be used by you as an aide to learning how to implement its various Solving Rules by yourself. Results are shown in different Colours for each Iteration, and different Fonts for each Rule.  
Every puzzle is assigned a numeric SHD Rating which is an estimate of the difficulty of solving the puzzle relative to the other puzzles. (Includes an attempt to rate unsolved puzzles).  
SudokuHelp+ Puzzle Classes are:  
Novice (no Candidate Elimination required)  26 Puzzles with SHD Ratings from 57  82 

Player (Basic Candidate Elimination needed to solve the puzzle)  30 Puzzles with SHD Ratings from 76  131 

Expert (Complex Candidate Elimination needed to solve it)  27 Puzzles with SHD Ratings from 93  238 

Master (single solution but not solvable with Rules currently implemented in SudokuHelp+)  1 Puzzle with an SHD Rating of 163 (although Version 3.0 of the SudokuHelp+Solver reduces it to the Expert level) 

SudokuHelp+ Testimonials  
"As a work colleague of Greg's and a fellow Sudoku addict, I have had the pleasure of using SudokuHelpPlus as a Beta tester during its development over the last 6 months. It's really fun using it to create and test your own puzzles and subsequently to solve them. With SudokuHelpPlus anyone can become a Sudoku puzzle creator. I get really excited when I solve a puzzle using SudokuHelpPlus that I cannot solve manually on paper. You will find more solving techniques in SudokuHelpPlus and you will become an expert at solving Sudoku. Believe me it's worth more than $10.00!"
Sangamnath Hulsoor (Melbourne, Australia). 

"I find SudokuHelpPlus to be the fastest, most efficient way to quickly understand Sudoku puzzlesolving methods. It takes the tedium out of Sudoku and lets you concentrate on finding the solution."
J. Reese Thomas (Houston, Texas, USA). 

"I really enjoyed the Player level puzzles. It was also very pleasing to discover that an increase in the SHD Rating invariably resulted in a commensurate increase in the time it took me to solve the puzzle. Despite a predisposition to dislike them (because I'm a numbers man), I even found myself enjoying the Cluedoku puzzles. I am looking forward to refining my techniques, with the use of SudokuHelpPlus, so that I can solve the more difficult Expert level puzzles."
Rob Pendlebury (Melbourne, Australia). 

"Really impressive software! Anyone from the paper and pencil novice to math PhD's and everyone in between should enjoy SudokuHelpPlus. It has everything from basic solving grids for just getting right down to a straightforward solution to very sophisticated programs that apply
some of the most challenging solving rules. This captures the whole world of Sudoku."
Jay Cutts (Tijeras, New Mexico, USA). 

SudokuHelp+ Screen Shot of the unsolved Puzzle No 60, where Elimination Grid entries automatically update the Work Grid.  
SudokuHelp+Solver
Screen Shot of Puzzle No 60 (solved to the point where the XYZap Rule does an elimination that unlocks the puzzle. Note also the new feature to highlight the last elimination done  a great way to see how the Solver did what it did.) 

SudokuHelpPlus as an aide to Sudoku puzzle construction  
The puzzles in SudokuHelpPlus were crafted using SudokuHelpPlus itself as an aide. Here's how: Plug a few values into the SudokuHelp+ worksheet in a nice symmetric pattern. To maintain 180^{o} rotational symmetry for every given value placed in a cell at (x,y) there must also be a given in the cell at (10x, 10y). Whilst such symmetry is no more essential to the construction of a valid Sudoku puzzle, than it is to the placement of blanks in a crossword puzzle, asymmetric Sudoku puzzles look just as ugly as asymmetric crosswords. Copy what you have to the SudokuHelp+Solver worksheet and see how much of it can be solved by clicking the Rules buttons. If it blows up, go back and change a few obvious culprits and try again. If it gets stuck in a loop, leaves a cell without a value or places the same value twice in the same Constraint Region, you may have to chuck in the whole design and start again. Typically though you will have made some progress and will have a significantly reduced possibility set for the rest of the puzzle. Go back to the SudokuHelp+ worksheet, plug in a few more values and try again. Repeat this process until you have a single solution valid Sudoku puzzle. Then begins the process of peeling away givens, and then checking that the puzzle is still solvable and perhaps in the process turning a lower Class puzzle into a higher Class one. Use the SudokuHelp+Solver to find the optimum path to the solution. This will then give the puzzle its SHD Rating. Finally use the various value conversion and puzzle transformation buttons in SudokuHelp+ to try to make the puzzle show the SHD Rating from within. Then the puzzle will need to be retested through the Solver to check that the optimum path to the solution, still shows the same SHD Rating. As a result of the transformations cells &/or values for some Rules may be processed in a different order requiring less iterations and thereby resulting in a different SHD Rating, where the puzzle will require further manipulative work. 