There are 2 books in the Game series. The newest book is The Gypsy Game which came out in 1997.

1
The Egypt Game

By Zilpha Keatley Snyder , Alton Raible (illustrator) ,

Book cover of The Egypt Game
The first time Melanie Ross meets April Hall, she's not sure they have anything in common. But she soon discovers that they both love anything to do with ancient Egypt. When they stumble upon a deserted storage yard, Melanie and April decide it's the perfect spot for the Egypt Game.…
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2
The Gypsy Game

The Gypsy Game
The kids from The Egypt Game are back, taking up right where they left off in the first novel. What game will they play next? The answer is Gypsies. While April plunges in with her usual enthusiasm, Melanie seems to be holding back. But it's Toby who adds a really…