Unhappy Birthday at Castle Slogar is a sorrowful solo gamebook filled with interactive puzzles. A full map of the castle shows which rooms you've explored. The book's sections describe each room, where you'll face a horrible hindrance or a character whose dismal dilemma you'll solve to access the next room. Having trouble? A special website provides hints and extra material. Unravel the riddles then use your answers to find the gloriously gloomy finale!