Killer Classic Sudoku 12x12
8 primary works
Book 1
Book 2
Book 3
Book 4
Book 5
Book 6
Сlassic 400 + Killer Easy - Medium levels sudoku 12 x 12
by Basford Holmes
Book 7
Сlassic 400 + Killer Medium - Hard levels sudoku 12 x 12
by Basford Holmes
Book 8