Alexander Rodriguez

Puzzles for Brain Skyscrapers - 200 Medium to Hard 8x8 vol. 2 (Skyscrapers, #2)

Puzzles for Brain Skyscrapers - 200 Medium to Hard 9x9 vol. 5 (Skyscrapers, #5)

Puzzles for Brain Skyscrapers - 200 Hard to Expert 8x8 vol. 3

Puzzles for Brain Skyscrapers - 200 Hard to Expert 9x9 vol. 6 (Skyscrapers, #6)

Puzzles for Brain Skyscrapers - 200 Easy to Medium 8x8 vol. 1

Puzzles for Brain - Hitori 200 Puzzles 25x25 vol. 10

Puzzles for Brain Binary- 400 Easy to Medium 13x13 vol. 25 (Binary, #25)

Puzzles for Brain Kakuro- 200 Puzzles 6x6 vol. 3

Puzzles for Brain Binary- 200 Easy to Medium 12x12 vol. 19 (Binary, #19)

Puzzles for Brain - Hitori 200 Puzzles 12x12 vol. 8 (Hitori, #8)

Puzzles for Brain - Hitori 200 Puzzles 8x8 vol. 7 (Hitori, #7)

Puzzles for Brain Binary- 400 Easy to Medium 12x12 vol. 22

Puzzles for Brain Kakuro- 200 Puzzles 7x7 vol. 4

Puzzles for Brain - Hitori 200 Puzzles 16x16 vol. 9 (Hitori, #9)

Puzzles for Brain Binary- 400 Easy to Expert 12x12 vol. 24 (Binary, #24)

Puzzles for Brain Binary- 200 Hard to Expert 12x12 vol. 20

Puzzles for Brain Binary- 400 Hard to Expert 12x12 vol. 23

Puzzles for Brain Kakuro- 200 Puzzles 9x9 vol. 6

Puzzles for Brain Kakuro- 200 Puzzles 8x8 vol. 5

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

Sudoku X Puzzles - 400 Easy to Expert 9x9 vol.10

Sudoku X Puzzles - 400 Easy to Medium 9x9 vol.8

Sudoku X Puzzles - 400 Hard to Expert 9x9 vol.9 (Sudoku X Puzzles, #9)

Sudoku X Puzzles - 200 Hard to Expert 9x9 vol.7 (Sudoku X Puzzles, #7)