ii Sudoku by Color is a simple, intuitive, interactive, and easy to use application.
ii Sudoku by Color 1000 includes 1,040 puzzles with even distribution of puzzle levels

It offers:
1. Seven puzzle levels - Easiest, Easier, Easy, Medium, Hard, Harder, and Hardest
2. Each puzzle level is methodically determined and explained
3. Ability to switch between Color and Classic modes with single press of a menu icon
4. Interactive or Do No Disturb puzzle check modes
5. Shows and updates possible values with each input (when selected)
6. Hint for difficult cells
7. Undo to clear a mistake
8. Ability to Save puzzle to resume later

It's a stand-alone program with embedded puzzles.
Online access is not necessary.
There are no advertisements.

And it's for everyone!

The following ii Sudoku by Color packages are also available:
ii Sudoku by Color 365 includes 405 puzzles with even distribution of puzzle levels - FREE
ii Sudoku by Color for Kids includes 400 puzzles with emphasis on Easy to Medium level puzzles - FREE
ii Sudoku by Color Premium includes more than 4,500 puzzles