The objective is simple: " Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. "
That's all there is to it. There's no math involved. The grid has numbers, but nothing has to add up to anything else. You solve the puzzle with reasoningand logic.
Sudoku became a rage among the Japanese in the late 1980s but it was not until 2005 that it caught the fancy of the rest of the world.
Recently Indian Newspapers - The Hindu, Hindustan Times, Deccan Chronicle and The Asian Age have started carrying Sudoku puzzles in their puzzles section and the puzzle seems to be catching up with the Indian public as well. I am wondering why Times of India is not following suit!