I am noticing a HUGE flaw. Every time a new board is drawn, the same 3 digit solution/pattern repeats on the board for each column of 3 digits (column 1-3, column 4-6, column 7-9). I mean, if row 1 column 1 starts with "123" then the same "123" is repeated in row 2 or 3 just in either column 4-6 and/or 7-9. This also happens for rows 4-6 and 7-9 (just different set of 3 numbers). This makes it possible for me to solve the board in 2 minutes. It is not totally random. You can …verify this by solving a board and looking for the patterns to repeat.

If someone else verifies this, please post a comment to confirm. More

For my super-competitive family, could you add a timer? This is so addictive!!

i can't move it in the screen

It's a really good start from a functionality point of view. It's just that the interface needs work. It's quite hard to work out where the 9 square boundaries etc are. I appreciate the difficulties with drawing the grid but currently the individual square surrounds are too heavy and the 9 square tint too light.

But the functionality is fine!

Finally a Su Doku widget for windows. However, the boxes are very hard to read and there should be a way to change the background.