Why is Sudoku so popular?

Contrary to what many people would have you believe, there are still lots of people who like to use their brains! Sudoku puzzles are absorbing without taking up too much time and can be designed with different degrees of difficulty. They can offer just the right degree of frustration to give a real sense of achievement when completed. Teachers can give simplified versions to children to stretch their minds, yet the most difficult can tax the most experienced puzzle solver.