The Times Online has a special again with a lot of different Sudoku Puzzles (Classic, Children, Super Fiendish and Killer Sudoku’s).
On the front is a special Sudoku puzzles, that the teams in the World Sudoku Championships were solving. To solve this variant of Sudoku you have to place a digit from 1 to 9 into each triangular cell, so that it appears once in each outlined shape, and in one horizontal and two diagonal directions (jumping any gaps).
You can find more information and a link to download the Spring Sudoku Special (pfd format) at the Games & Puzzles page of Times Online. Happy Puzzling!