Guru Multi Riddle

Guru Maggot Riddle - Black

The Riddle of the Fractal Monks: 3 (A Mathematical Mystery)

Guru Inc

The Guru Principle

Guru Incredible Pult

Zany School Riddles

Guru - Fusion Carryall

Suguru Adult Puzzle Book: 1000 Hard Number Blocks (12x12) Puzzles (The Big Books of Logic Puzzles Series)

Guru - Fusion 110

The Master of Go

Suguru (Number Blocks): 500 Hard to Extreme : (9x9) Puzzles (Logic Puzzles for Adults Series)

The World’s Best Book of Riddles: More than 150 brainteasers for

Mensa(r) Presents: The Big Book of Brain Benders : 200 Puzzles and Riddles from the Smartest Brand in the World (Improve Your Memory, Concentration, Creativity, Reasoning, Problem-Solving)

Suguru (Number Blocks): 500 Medium to Very Hard : (9x9) Puzzles (Logic Puzzles for Adults Series)

The Guardian All-New Sudoku 1: A collection of more than 200 fiendish puzzles (Guardian Puzzle Books)

Another 50 Logic Puzzles: Full of Fun Logic Grid Puzzles!: 6 (Brain Teaser Puzzle Books)

50 Logic Grid Puzzles | Hours of challenging fun | Logic Puzzle Book for Adults: Fun and Challenging Logic Grid Puzzle Book

The Kids’ Book of Awesome Riddles: More than 150 brain teasers f

Guruji and his Pearls of Wisdom: Tales of Genuine Profoundness By Anji Pink

SUGURU EASY - MEDIUM - HARD: 600 PUZZLES WITH ANSWERS

Creator of puzzles - Suguru 240 Expert Puzzles 10x10 (Volume 12)

50 Logic Puzzles: Full of Fun Logic Grid Puzzles!: Volume 2 (Brain Teaser Puzzle Books)