The Times Ultimate Killer Su Doku Book 11: 200 challenging puzzles from The Times (The Times Su Doku)

The Times Ultimate Killer Su Doku Book 11: 200 of the Deadliest Su Doku Puzzles

The Times Ultimate Killer Su Doku Book 15: 200 of the deadliest Su Doku puzzles

The Times Su Doku – The Times Ultimate Killer Su Doku Book 14: 200 of the deadliest Su Doku puzzles