Qt4 examples.
SudokuResolver (qt4, only 180K)
screenshot
http://rainbowsally.org/pub/sudoku.png
I got this at
http://setup.weeb.ch, I believe. I reworked the make system using mc2 and made a few very minor changes, such as centering the window on showEvent() and addding save/restore to/from files.
There are several interesting features in the code from grid setup to BigList STL templates
and multi core processing code.
...