Set of 9 cards. From the YOTO website - Yoto says: Jamal and Kat are on a scavenger hunt around the solar system! Join them on an interactive space adventure to explore all eight planets. Kat and Jamal are in their last year of Solar System Space Camp. Their final mission? A scavenger hunt around all eight planets. Using nine Solar System cards, kids become space cadets, joining Kat, Jamal and their trusty Transmitter as they find flags and unlock clues on each planet in our solar system. Start your space adventure with the Sun card before exploring further afield. Switch cards to land on Mercury and learn everything there is to know about the rocky planet while searching for the flag. Then unlock your clue and head back to the Sun to carry on the mission. (Or, stay on the planet and discover a secret quiz…) What will the clues reveal? Only those who complete the mission will find out.