Jeff Heldt

Math Puzzles For Grade 4 (Math Puzzles and Brainteasers, #2)

Math Brain Teasers For Adults With Answers (Brain Teaser Books, #5)

Puzzles And Brain Teasers With Answers (Logic and Math Puzzle Books, #4)

Difficult Puzzle Games (Brain Teaser Books, #2)

Mind Teaser Games For Adults (Logic and Math Puzzle Books, #2)

Simple Brain Teasers With Answers (Brain Teaser Puzzles for Adults, #2)

Maths Teasers For Adults (Sudoku Puzzle Books, #1)

Puzzle And Logic Games (Logic and Math Puzzle Books, #3)

Small Brain Teaser Puzzles (Brain Teaser Puzzles for Adults, #3)

Quick Brain Teasers For Adults (Logic and Math Puzzle Books, #6)

Short Math Puzzles (Brain Teaser Puzzles for Adults, #1)

Puzzles Based On Mathematics (Logic and Math Puzzle Books, #5)

Japanese Puzzle (Brain Teaser Books, #4)

Easy Brain Teasers For Adults (Brain Teaser Books, #3)

Math Logic Puzzles For Adults (Logic Puzzle Books, #1)

Mental Maths Puzzles (Logic and Math Puzzle Books, #1)

Crazy Puzzles (Brain Teaser Books, #1)

Brain Stimulating Games (Brain Teaser Puzzles, #4)

Best Puzzle Games (Brain Teaser Puzzles, #2)

Challenging Brain Teasers For Adults (Brain Teaser Puzzles, #5)

Brain Challenges For Adults (Brain Teaser Puzzles, #3)

Best Maths Puzzles With Answers (Brain Teaser Puzzles, #1)

Slide Puzzles (Logic Puzzles and Teasers, #4)

Mental Games (Math Brain Teasers for Adults, #4)