Jeff Heldt

Book #1: Brain Logic Puzzles

Book #1: 5th Grade Math Puzzles

Book #1: Best Brain Games

Book #2: Brain Teasers And Answers For Adults

Book #3: Brain Teasers And Riddles For Adults

Book #4: Easy Mathematical Puzzles

Book #5: Fun Brain Games

Book #1: Crazy Puzzles

Book #2: Difficult Puzzle Games

Book #3: Easy Brain Teasers For Adults

Book #4: Japanese Puzzle

Book #5: Math Brain Teasers For Adults With Answers

Book #1: Best Maths Puzzles With Answers

Book #2: Best Puzzle Games

Book #3: Brain Challenges For Adults

Book #4: Brain Stimulating Games

Book #5: Challenging Brain Teasers For Adults

Book #1: Short Math Puzzles

Book #2: Simple Brain Teasers With Answers

Book #3: Small Brain Teaser Puzzles

Book #1: Brain Teaser Games And Puzzles

Book #2: Complex Math Puzzles

Book #3: Daily Maths Puzzle

Book #1: Hard Mind Puzzles

Book #1: Best Mind Teasers

Book #2: Brain Teasers With Answers For Students

Book #3: Kakuro Puzzle

Book #1: Brain Training Puzzles

Book #2: Difficult Maths Puzzles With Answers

Book #1: Mental Maths Puzzles

Book #2: Mind Teaser Games For Adults

Book #3: Puzzle And Logic Games

Book #4: Puzzles And Brain Teasers With Answers

Book #5: Puzzles Based On Mathematics

Book #1: Block Puzzle Classic

Book #1: Math Logic Puzzles For Adults

Book #2: Block Puzzles

Book #3: Brain Tickler

Book #4: Fun Logic Games

Book #1: Number Brain Teasers

Book #2: Puzzle Games For Girls

Book #3: Puzzles For Brain Development

Book #4: Quick Puzzle Games

Book #5: Square Puzzles

Book #1: Ying - Yang Puzzles

Book #2: Mind Games

Book #3: Puzzles Based On Maths

Book #4: Slide Puzzles

Book #1: Fun Brain Teaser Games

Book #1: Brain Teasers And Games

Book #2: Fun Mind Games

Book #2: Easy Maths Puzzles With Answers

Book #3: Small Mind Puzzles

Book #1: Math Games

Book #2: Mathematical Brain Teasers

Book #3: Mathematics Puzzle Games With Answers

Book #4: Mental Games

Book #1: Maths Small Puzzles

Book #1: Mathematical Puzzles For Children

Book #1: 4th Grade Math Riddles

Book #2: Math Puzzles For Grade 4

Book #3: Math Puzzles For Grade 6

Book #4: Math Puzzles For Grade 7

Book #1: Maths Teasers For Adults