proposed hint system

[GoogleCodeExporter]

Have there be a "correct guesses once" option available.  When this is chosen, 
the game will 
turn red any hint you've already placed for which there already is one of that 
number in the 
row or column. It's not as powerful as just giving me some random, correctly 
placed 
number, therefore this is kind of a "beginner hint": it requires that you're 
trying to guess, 
and usually doesn't give you an answer.  And I said "once" to keep it from 
flagging ALL of 
my wrong guesses-- once I use this one hint, the other places I'm screwing up 
may become 
clear-- that leaves it still a challenge.

Original issue reported on code.google.com by [email protected] on 2 Oct 2009 at 11:59