It doesn't really have any practical purpose - if you actually like Sudoku, then you'll solve puzzles by hand; and if you're actually trying to crack Sudokus algorithmically, then you'll probably write your own solver (and Rainmeter is not the best medium). I just wrote it as a personal exercise. It should solve any valid Sudoku grid - though if you don't give it enough constraints (clues) then it will only provide one of multiple possible solutions.
The coolest script feature is a "bullet time" mode - when it's on, the Lua script will update the skin every time the algorithm assigns a value to a cell, so you can watch the program solve the puzzle in slow motion. For example, here's a .gif showing the skin solving Arto Inkala's 2010 puzzle. It can be turned on and off by using the skin's context menu.
- Left-click a cell to show a digit chooser for that cell
- Right-click the chooser to dismiss it
- Right-click a filled cell to clear it
- Scroll up/down on a cell to increment/decrement its value
I'm working on a Sudoku Rainmeter skin (a game, not a solver). The skin is ready, but now I'd like to add a solver lua script, which could solve the grid, on a button click. I found your Sudoku solver skin and found it interesting, but despite I'm working by a few days onto it, I can't modify your lua script to match my purposes. So, I'm asking you, if you can and have time, to assist me onto this.