Sudoku by CB online/print version
Play Sudoku online. Over 35 000 great maps available. Have fun.
How to play: the goal is to fill in the empty cells, one number in each, so that each column, row, and region contains the numbers 1-9 exactly once. What is Sudoku you can read on Wikipedia.
Tip: You can print Sudoku right here and right now. Just select File\Print in browser. Paper puzzles can be even more interesting than electronic.