87 books • 13 series
Mensa IQ Workbook
The Second Book of 100 New Crosswords
Bumper Quiz Book for the Family
The Hutchinson Puzzle Book (Helicon general encyclopedias)
Bumper Quiz Book for Kids
100 Modern Crossword Puzzles
100 New Crossword Puzzles
Improve Your IQ
The Complete Guide to Word Games and Puzzles
Classic Brain Puzzlers
IQ Firepower
IQ Powerplay
IQ Hotshots
The Great IQ Challenge
Getting Better at IQ Tests
Test Your Word Power
The New IQ Test
Word Puzzles
Beat the IQ Challenge (Test Your Intelligence S.)
Number Puzzles
Check Your IQ
Picture Puzzles
Young Genius Book of Brain Teasers (Test Your Intelligence S.)
Power Puzzles (Mensa puzzle books)