David Smith

Killer Sudoku - 200 Hard Puzzles 9x9 vol.17 (Killer Sudoku, #17)

Killer Sudoku - 200 Easy Puzzles 9x9 vol.15 (Killer Sudoku, #15)

Killer Sudoku - 200 Master Puzzles 10x10 vol.22 (Killer Sudoku, #22)

Killer Sudoku - 200 Normal Puzzles 9x9 vol.16 (Killer Sudoku, #16)

Outside Sudoku - 200 Hard to Master Puzzles vol.9 (Outside Sudoku, #9)

Outside Sudoku - 200 Easy to Master Puzzles vol.10 (Outside Sudoku, #10)

Killer Sudoku - 200 Easy Puzzles 10x10 vol.19 (Killer Sudoku, #19)

Killer Sudoku - 200 Normal Puzzles 10x10 vol.20 (Killer Sudoku, #20)

Killer Sudoku - 200 Master Puzzles 9x9 vol.18 (Killer Sudoku, #18)

Outside Sudoku - 200 Easy to Normal Puzzles vol.7 (Outside Sudoku, #7)

Killer Sudoku - 200 Hard Puzzles 10x10 vol.21 (Killer Sudoku, #21)

Outside Sudoku - 400 Easy to Normal Puzzles vol.11 (Outside Sudoku, #11)

Outside Sudoku - 400 Hard to Master Puzzles vol.12 (Outside Sudoku, #12)

Outside Sudoku - 200 Normal to Hard Puzzles vol.8 (Outside Sudoku, #8)

Control Systems for Complete Idiots

Killer Sudoku - 400 Easy to Master Puzzles 12x12 vol.14 (Killer Sudoku, #14)

Killer Sudoku - 400 Easy to Master Puzzles 9x9 vol.13 (Killer Sudoku, #13)

Slitherlink Puzzles - 200 Easy to Normal Puzzles 12x12 vol.15 (Slitherlink Puzzles, #15)

Big Suguru Book - 400 Easy to Master Puzzles 7x7 vol.9 (Big Suguru Book, #9)

Killer Sudoku - 200 Normal to Hard Puzzles 9x9 vol.10 (Killer Sudoku, #10)

GWR Signalling Practice

Slitherlink Puzzles - 200 Easy to Normal Puzzles 25x25 vol.19 (Slitherlink Puzzles, #19)

Sudoku Mine - 200 Normal Puzzles 9x9 vol.2 (Sudoku Mine, #2)

Sudoku Mine - 200 Master Puzzles 9x9 vol.4 (Sudoku Mine, #4)