Title: Mega Sudoku 16x16 - Da Facile a Diabolico - Volume 29 - 276 Puzzle, Author: Nick Snels
Title: Mega Sudoku 16x16 - Medio - Volume 31 - 276 Puzzle, Author: Nick Snels
Title: Mega Sudoku 16x16 - Diabolico - Volume 33 - 276 Puzzle, Author: Nick Snels