520 books • 20 series
X-Diagonal - Takedoku Sudoku - 250 Puzzles Gold Level - Vol. 216
X-Diagonal - Takedoku Sudoku - 250 Puzzles Bronze Level - Vol. 214
X-Diagonal - Takedoku Sudoku - 250 Puzzles Silver Level - Vol. 215
Sudoku Takedoku - 250 Puzzles Bronze Level - Vol. 210
Sudoku Takedoku - 250 Puzzles Silver Level - Vol. 211
Aircraftdiku - Anti-Diagonal Sudoku - 250 Puzzles Gold Level - Vol. 206
Anti-Diagonal Sudoku - Aircraftdoku - 250 Puzzles Bronze-Silver-Gold Vol. 209
Aircraftdoku - Anti-Diagonal Sudoku - 250 Puzzles Bronze-Silver-Gold. Vol. 207
X Diagonal Sudoku - Aircraftdoku - 250 Puzzles Bronze-Silver-Gold Vol. 208
Sudoku Takedoku - 250 Puzzles Gold Level - Vol. 212
Sudoku Takedoku - 250 Puzzles Bronze - Silver - Gold Levels - Vol. 213
Aircraftdoku - X-Diagonal Sudoku - 250 Puzzles Bronzelevel - Vol. 200
Aircraftdoku - 'x-Diagonal Sudoku - 250 Puzzles Bronze-Silver-Gold - Vol.203
Aircraftdoku - Anti-Diagonal Sudoku - 250 Puzzles Silver Level - Vol. 205
Aircraftdoku - X-Diagonal Sudoku - 250 Puzzles Silver Level - Vol. 201
Aircraftdoku - Anti-Diagonal Sudoku - 250 Puzzles Bronze Level - Vol. 204
Aircraftdoku - X-Diagonal Sudoku-250 Puzzle Gold Level - Vol. 202
Medal Sudoku - X Diagonal - 250 puzzles Bronze level - Vol. 196
Classic Sudoku 12x12 - Anti-Diagonal - 250 Puzzles Bronze-Silver-Gold - Vol.195
Medal Sudoku - X Diagonal - 25 Puzzles Bronze - Silver - Gold - Vol. 199
Classic Sudoku 12x12 - X Diagonal - 250 Puzzles Bronze-Silver-Gold - Vol.194
Samurai - 250 Diagonal Sudoku - Puzzles Bronze - Silver - Gold - Vol. 188
Rose of Wind Sudoku - Anti-Diagonal - 250 Puzzles Bronze-Silver-Gold - Vol.193
4 Cross Sudoku - Anti-Diagonal - 250 Puzzles Bronze - Silver - Gold - Vol. 191