E-mail challenge - more challenges
Some challenges just for fun:
http://sudokucup.com/node/2917/?mode=multiplayer&resid=40382&oppid=1&kor...
http://sudokucup.com/node/2917/?mode=multiplayer&resid=40849&oppid=1&kor...
http://sudokucup.com/node/2917/?mode=multiplayer&resid=40850&oppid=1&kor...
http://sudokucup.com/node/2917/?mode=multiplayer&resid=40853&oppid=1&kor...
http://sudokucup.com/node/2917/?mode=multiplayer&resid=40856&oppid=1&kor...
http://sudokucup.com/node/2917/?mode=multiplayer&resid=40857&oppid=1&kor...
