The New York Times Will Shortz's Xtreme Xwords: 75 Ultra-Challenging Puzzles for the Gutsy, Truly Bold and Fearless Solv

Name: The New York Times Will Shortz's Xtreme Xwords: 75 Ultra-Challenging Puzzles for the Gutsy, Truly Bold and Fearless Solv
Author: /author/Will_Shortz_(Sudoku_Easy_to_Hard%3A_Presented_by_Will_Shortz%2C_Volume_2)