The Times Big Book of Killer Su Doku: Book 1 presents a collection of 200 advanced logic puzzles that integrate arithmetic challenges with the standard Sudoku format. This volume is designed for solvers seeking a significant mental workout, eschewing introductory puzzles for a range of Moderate, Tricky, Tough, and Deadly difficulties. The core challenge involves not only completing the 9x9 grid with numbers 1-9 in each row, column, and 3x3 box, but also ensuring that pre-defined outlined regions sum to a specific target number. This dual requirement elevates the complexity, demanding both numerical accuracy and strategic deduction.

This volume is presented as the latest installment in The Times' popular Killer Su Doku series, indicating a consistent demand for its challenging puzzles. The description emphasizes an elevated difficulty level, suggesting it appeals to experienced puzzle enthusiasts who enjoy rigorous mental exercises. The integration of arithmetic alongside standard Sudoku logic points to a specific niche within the puzzle market, likely attracting those who appreciate complex problem-solving and a demanding cognitive challenge.