90% of people in Singapore are still not familiar with Sudoku, although it has appeared in the newspapers for two years.
Those who are familiar with this puzzle work on it every day. It keeps the mind alert.
I have four tips to help you solve Sudoku puzzles at all levels, including the difficult (four star) puzzles.
It can be found in this webpage:
http://project.bestsimulation.sg/logic9v4/tips.asp
It takes only TEN minutes to learn the four tips. You can practice on the puzzles. You will be an expert within 2 weeks.
Try it.
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