I’ve been a fan of brain games for some years now. One of my favorites is Sudoku.
Some Sudoku puzzles are incredibly difficult, and can take hours to complete. If you’re into Sudoku but find yourself getting stumped by some of the more difficult puzzles, I recommend searching Google for the term “solve difficult sudoku” (without the quotes).
I’ve gone through all of the techniques for solving the most difficult Sudoku puzzles, and encapsulated them into a simple-to-use website which you can use if you’re stump. It can either get a hint for the next move, or solve the entire puzzle for you (assuming it’s solvable).
Have a look! The site is located at http://SudokuRescue.com