The book's name is derived from that of Leonardo Fibonacci and Geronimo. Fibonaccio! is a quiz book featuring 400 sets of 10 themed questions (plus a tie-breaker) numbered consecutively using the Fibonacci sequence of 1, 1, 2, 3, 5, 8, 13, 21, 34, and 55, with the point value for each correct answer set by its number, the maximum and hardest, being 55, with a bonus of 89 points for answering all 10 questions correctly, thus scoring a Finonaccio!.