This book presents 100 of the most challenging Su Doku puzzles, designed for experienced solvers seeking extreme difficulty. The puzzles are a variant of Samurai Su Doku, where each 9x9 grid must contain the digits 1 to 9 in every row, column, and 3x3 box. The complexity is amplified by the interlocking nature of the grids, providing additional clues and increasing the challenge. The book offers four difficulty levels: Easy, Mild, Difficult, and Super Difficult, ensuring a rigorous test for even the fastest solvers.

This collection is positioned as the most difficult in The Times Su Doku range, targeting fearless warriors of the puzzle. The extended Samurai format, with its interlocking grids, promises hours of engagement and requires significant logical deduction. It is designed to challenge even the most seasoned Su Doku enthusiasts with its ultra-complex, extended brainteasers.