Edition Cambridge University Press, Second Edition 1994. The new and unread book remains in very good condition. Immaculate throughout. Prompt dispatch from UK
This entire series is great for finding new activities to liven up your class. I love these books, but let's be clear that what they provide is a group of tactics, not the big picture strategy needed to win the war but rather the battlefield tactics necessary to make a specific lesson more engaging. Don't expect discussion of assessment, these are just games.
Search for Cambridge Handbook for Language Teachers to see the whole series, there are maybe 20 or 30 titles.
If you are just building a professional library I would NOT start with these books. Start with something like Omaggio's book (hopefully I'll remember to add the full citation here when I get back to school... those books I still keep near my desk to peruse during prep periods). Omaggio gives you a better understanding of the process of building all language skills through a well-designed program, and how to intelligently build such a program taking into account the needs of your specific students.