This book presents a collection of 200 Killer Su Doku puzzles designed to challenge solvers with an added arithmetic component. The puzzles utilize the standard 9x9 grid but require players to not only ensure each row, column, and 3x3 box contains the numbers 1-9, but also that outlined regions sum to a specified number. The collection features Moderate, Tricky, Tough, and Deadly difficulty levels, offering no simple warm-up puzzles and targeting solvers who enjoy pushing their mental limits.

This volume in The Times's Killer Su Doku series is presented as a significant step up in difficulty, focusing on solvers who seek a rigorous mental challenge. The inclusion of arithmetic alongside traditional Su Doku rules aims to push players beyond their comfort zones. The curated selection of puzzles, ranging from Moderate to Deadly, suggests a focus on sustained engagement for enthusiasts of complex logic problems.