The Hunger by L.J. Smith
In this first installment of the trilogy, we meet Jenny Thornton who is searching for a fun gift to bring to her boyfriend's party. She stumbles upon a store she never knew existed and meets the store's only employee, the oh-so-gorgeous Julian, who sells her a game in a plain, white box. Once she makes it to the party, however, Jenny thinks she may have made a mistake. Her friends decide to give the game a try, however, and in doing so they begin the fight for their lives.
This book is part Labyrinth and part Jumanji. A young David Bowie can easily be imagined as Julian. And a game coming to life and forcing its players to fight for their lives within the constraint of The Game? Well...that's obviously Jumanji (although I think Jumanji came a short while later?)
If you've enjoyed The Vampire Diaries or The Secret Circle, be sure to check out this other gem from L.J. Smith. This is easily my favorite Smith book/series.