There are 3 books in the Gollywhopper Games, 2 series. The newest book is Friend or Foe which came out in 2015.

1
The Gollywhopper Games

By Jody Feldman , Victoria Jamieson (illustrator) ,

Book cover of The Gollywhopper Games
Jody Feldman's popular, award-winning novel about a group of kids playing the Gollywhopper Games-the fiercest toy company competition in the country-will appeal to fans of The Amazing Race and Charlie and the Chocolate Factory! Gil Goodson has been studying, training, and preparing for months to compete in the Gollywhopper Games.…
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2
The New Champion

By Jody Feldman , Victoria Jamieson (illustrator) ,

Book cover of The New Champion
The Golly Toy and Game Company is hosting the regional rounds for the next Gollywhopper Games, and this time it's brother against brother in the physical challenges and mental puzzles. The companion to the popular The Gollywhopper Games will appeal to fans of Escape from Mr. Lemoncello's Library, Charlie and…

3
Friend or Foe

By Jody Feldman , Victoria Jamieson (illustrator) ,

Book cover of Friend or Foe

This companion to the popular The Gollywhopper Games, a book named to twenty-six state award master lists, will appeal to fans of The Amazing Race, Charlie and the Chocolate Factory, and Escape from Mr. Lemoncello’s Library. Chock-full of puzzles, riddles, and challenges for the reader to solve along with the…