Title: Sudoku U: Senior Year, Author: Frank Longo
Title: Sudoku U: PhD in Sudoku, Author: Frank Longo
Title: Sudoku U: Junior Year, Author: Frank Longo
Title: Word Search Sudoku, Author: Frank Longo
Title: Hard Sudoku, Author: Frank Longo
Title: Easy Sudoku, Author: Frank Longo
Title: Sudoku U: Freshman Year, Author: Frank Longo
Title: Number-Crunching Sudoku: Math + Sudoku = 2× the Fun, Author: James W. Liber
Title: Sudoku U: Sophomore Year, Author: Frank Longo