The Times Ultimate Killer Su Doku Book 11: 200 of the Deadliest Su Doku Puzzles (Times Su Doku) Paperback – April 1, 2019

Ultimate killer sudoku addicts will appreciate this brilliant collection of brain-bending number puzzles. Finally a Times-series book release where the first 50 puzzles aren't wasted on "moderate" simplicity.I consider The Times series as the only ultimate killer sudoku challenge out there. The first seven books in The Times ultimate killer series had only 150 puzzles, and the first 50 were always a waste for lack of difficulty. The last four editions contain a hefty 200 puzzles. But in Book 11, ALL puzzles challenge even the most sophisticated puzzlers. You can't breeze through them without paying attention. Some actually require more than 30 minutes to solve.I just re-ordered Book #11 so I can do them all again.

I bought 4 books to get me through the pandemic!

Puzzles in this book seem less challenging than similarly rated puzzles in previous books.