This free Sudoku software for Linux (KDE/Qt) has three difficulty levels and offers options to either print the Sudoku grid or play on the computer screen.

Another plus is that you have the option to print out the Sudoku grids or simply play on your computer screen. And the best part? No need for installation! All you have to do is download the sudoku.rar file, unpack it, and you're ready to go. It's that easy!
One of the most impressive things about Free Sudoku for Linux is its ability to save solved or unsolved Sudokus into a file with the extension "sdk". This means you can come back to your progress at any time, with your files automatically loaded in the 9x9 Sudoku grid.
Overall, I highly recommend Free Sudoku for Linux (KDE/Qt version) to anyone looking for a fun and hassle-free Sudoku experience. Give it a try and see for yourself!
Version 1.1: N/A