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· Tim (Dotyisle)
· Chelsea (Kiwi)
· Megan (Megan)
· Wendy (WendyR)
· John (Cheerful)
· Chris (fyrfytr187)
If you want to use this QR code (Quick Response code) just save the image and paste it where you want. You can even print it and use it that way. Coffee cups, T-Shirts etc would all be good for the QR code.
My favourite sudoku books, for those who have begun to get bored by regular "difficult" sudoku, are the Mensa Absolutely Nasty Sudoku, by Frank Longo. There are four levels. The first two are pretty straightforward, requiring only basic skills. But levels three and four use the advanced techniques that you can learn about from the link above. Those are challenging enough to make me forget pain.