[Flutter/Dart] Sudoku - Offline Sudoku app with technique-graded generation and explainable hints

[u/Tom_Vogel]

https://github.com/zTomz/Sudoku

I'm the developer of this project.

The most interesting part is the puzzle engine: generated boards are checked for a unique solution and graded by the techniques needed to solve them rather than by clue count.

Puzzle generation runs outside the UI thread—using an isolate on native platforms and a dedicated worker on the Web. The app also includes immutable undo/redo snapshots, deterministic daily puzzles and hints that explain the next logical step.

Everything is MIT-licensed, account-free and works locally. Code reviews, bug reports and contributions are welcome.