Sudoku

Have you ever played a game called sudoku? It's a puzzle with 9 rows and 9 columns that are divided into 3x3 boxes where you have to fill them with numbers of 1-9 for each box, each column and each row, no repetition. When I first started to play this game, I was amazed by how anyone could think of such game by placing numbers in strategic positions, hinting what other numbers could be place in that box. It's a game of logical thinking, brain teasers others may call it, to exercise your brain, to train us to spot the hints and solve problems....brilliant. Try the one below, I got it from a software with 500 pieces of it with 5 different levels(this is in the hardest level). If you want to get this software, it's free from http://www.sudoku-puzzles.net/