Title: Sudoku U: Freshman Year, Author: Frank Longo
Title: Sudoku U: Senior Year, Author: Frank Longo
Title: Sudoku U: PhD in Sudoku, Author: Frank Longo
Title: Hard Sudoku, Author: Frank Longo
Title: Easy Sudoku, Author: Frank Longo
Title: Word Search Sudoku, Author: Frank Longo
Title: Sudoku U: Junior Year, Author: Frank Longo
Title: Sudoku U: Sophomore Year, Author: Frank Longo
Title: Feng Shui Sudoku, Author: Frank Rubin