Free Sudoku
There are lots of Sudoku games available - this is yet another...
Before starting a game, you can set three options:
- Training mode allows FreeSudoku to give you hints.
- Symmetric games are mirror-symmetrical - this looks pretty, but is otherwise irrelevant
- Consistency checking helps prevents silly mistakes, like entering impossible numbers. Some regard this as cheating...
All options are off by default.
There are five difficulty levels. These are based on the complexity of the strategies required to solve the puzzle.
The numbered buttons highlight all existing entries of a particular digit. Click the same digit again to remove the highlighting.
Repository
The source code for the program is here https://gitlab.com/kri/free-sudoku
You can also download a JAR file and run it directly. Note that you must have Java installed in order to run this program!
History
FreeSudoku is a GPL-licensed program whose home was once http://freesudoku.sourceforge.net/. Unfortunately, the project was apparently abandoned. Some years ago, I forked it and made a number of improvements.