Sudoku is a logic game that can help to keep our brains fresh and active. If you do not know how to play Sudoku puzzles, you can find the rules here.
Relatively easy Sudoku puzzles can be solved by a sequence of eliminations - eliminations of all impossibilities. However the difficult ones need more logic involved. Here is a list of tips and techniques that may help you to solve the puzzles. The first three in this list are basic techniques that are essential for solving any Sudoku puzzles. The others are considered as more advanced techniques.