520 books • 20 series
4 Towers Sudoku - 250 Level Gold - X Diagonal - Master - Vol. 165
4 Towers Sudoku - 250 Level Bronze - X Diagonal - Master - Vol. 163
4 Towers Sudoku - 250 Level Platinum - X Diagonal - Master - Vol. 166
4 Towers Sudoku - 250 Level Silver - X Diagonal - Master - Vol. 164
4 Towers Sudoku - 250 Level Platinum - X Diagonal - Junior - Vol. 162
4 Towers Sudoku - 250 Level Gold - X Diagonal - Junior - Vol. 161
4 Towers Sudoku - 250 Level Silver - X Diagonal - Junior - Vol. 160
4 Towers Sudoku - 250 Puzzles - Level Gold - Master Version - Vol. 157
4 Towers Sudoku - 250 Puzzles - Level Platinum - Junior Version - Vol. 154
4 Towers Sudoku - 250 Puzzles - Level Bronze - Master Version - Vol. 155
4 Towers Sudoku - 250 Puzzles - Level Gold - Junior Version - Vol. 153
4 Towers Sudoku - 250 Level Bronze - X Diagonal - Junior - Vol. 159
4 Towers Sudoku - 250 Puzzles - Level Silver - Master Version - Vol. 156
4 Towers Sudoku - 250 Puzzles - Level Platinum - Master Version - Vol. 158
Hikaku Sudoku 9 x 9 - 250 Wheel of Fire Puzzles - Level Gold
4 Towers Sudoku - 250 Puzzles - Level Silver - Junior version - Vol. 152
4 Towers Sudoku - 250 Puzzles - Level Bronze - Junior Version - Vol. 151
250 Points Puzzles - Anti - Diagonal. Vol. 144
Hikaku Sudoku 9 X 9 - 250 Octagonal Star Puzzles - Level Gold
Hikaku Sudoku 9 X 9 - 250 Wheel of Fire Puzzles - Level Bronze
250 Points Puzzles - Windowdoku. Vol. 141
Hikaku Sudoku 9 X 9 - 250 Wheel of Fire Puzzles - Level Silver
250 Points Puzzles - Anti - Knight. Vol. 142
Hikaku Sudoku 9 X 9 - 250 Octagonal Star Puzzles - Level Bronze