GGrandpa SudokuGrandpa Sudokude Samworld Press, Daniel ParkerEdiciones (1)Grandpa Sudoku (2020)Independently Published · inglés · ISBN 9798663620550Más obras de Samworld PressWWorld's Best PE Teacher Plays SudokuWorld's Best PE Teacher Plays SudokuEEasy Sudoku PuzzlesEasy Sudoku PuzzlesWWorld's Best Doctor Plays SudokuWorld's Best Doctor Plays Sudoku