If the game is free, do you make any money for all the work you put into it?
Well, the "basic version" is free. You get 100 puzzles.
If you want more difficult ones, or 13,500 puzzles, you can pay the whopping $1 for the "Premium Edition".
The Android version will mostly monetize through advertising. I'm hoping to finish up that version and release it in the next couple days.
I realize that most Sudoku players would prefer a portable (phone, tablet) version of a game like this. Few people would play games like this on their desktop PC. But still, I wanted to release it.
The development system I'm using allows you to write once and release on many platforms. So the desktop version is mostly a bonus.