Goosebumps HorrorLand: Heads, You Lose (Book 15) - R. L. Stine

Heads, You Lose, the fifteenth book in the Goosebumps HorrorLand series, follows friends Marty and Lizzy as they become caught in a dangerous game with horrifying consequences. Their troubles begin when they discover a strange coin that appears to grant wishes.

At first the coin seems magical, but each wish quickly twists into something sinister. As eerie events escalate, Marty and Lizzy are forced into a series of frightening challenges that test their courage and their friendship.

With danger closing in, the two must uncover the truth behind the coin and outsmart the dark forces controlling it - before the price they pay becomes fatal, starting with their own heads.