Wujec T. Pumping Ions; Games and Exercises to Flex Your Mind

Doubleday Canada Limited, 1988. - 248 p.Mack's Mental Gymnasium
Better Thinking and Thinking Better
Loosening Up
Mental Movement
Mental Calisthenics
Mental Gymnastics I
Mental Gymnastics II
Mental Strength
Mental Play
Reaching Back
Mental Flexibility
Mental Balance
Improvising
Peak Performance
Keeping Fit
Return to Mack's Mental Gymnasium
End Stuff: Answers to Puzzles and Problems