It's tricky, it's addictive, it will test your powers of logic - The Sun Su Doku is set to sweep the nation.

The Sun launched Su Doku on May 10th 2005 and, already, solvers are crying out for a book packed with puzzles. Sun Doku is based on the Japanese puzzle Sudoku which roughly translated means `single number'. It has been the most popular logic puzzle in Japan for 20 years. It requires no calculations or knowledge of maths - it works pure and simply on logic and elimination. Here you have 100 puzzles with three degrees of difficulty - Teaser, Toughie and Terminatoor. Infuriating and compulsive but great fun.