Brain Quest 4-book set to support children's learning, with 350-400 questions per age group. - Set includes: Brain Quest 4-book set - Target age: 2-6 years old - Number of questions: 350-400 - Accessories: Includes a storage bag (Ages 2-3 has one, Ages 3-4 does not have one, Ages 4-5 and 5-6 are unopened, so the presence of a storage bag is unconfirmed) - Ages 4-5 and 5-6 are new and unopened. Thank you for looking.