Coloured numbers and notes.

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Add ability to set color of entered numbers and notes.

Original issue reported on code.google.com by romario...@gmail.com on 2 Oct 2009 at 7:21

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Rationale:
> Given two alternatives, it is really hard to solve a puzzle if you have only
> one note-type - you would need to note both alternative solutions at the same 
time.
>
> If notesnumbers could be colour-coded it would be possible to juggle two 
guesses at
one time.
> Because if you guess correctly you end up filling the whole board, which
> often requires subsequent guesses aswell. With both alternatives covered the
> bad one will lead to contradiction earlier.

Original comment by patrik0c...@gmail.com on 2 Oct 2009 at 7:45

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[deleted comment]

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I don't understand the rationale on this one, but maybe what's being asked 
isn't what I think it is. I used to play a version of sudoku on my old j2me 
phone called 5ud0ku, which had a different color for each number. It just 
helped you pick out the numbers easier. 7s were always blue for example. I 
could glance across the board for blue rather than the shape of a 7. Here's a 
link (click on screenshots): http://www.mobilerated.com/5ud0ku-1347.html

Original comment by ksau...@gmail.com on 21 Apr 2011 at 3:26

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