This puzzle is a perfect activity for children aged 4 and up. It is also a good family activity for parents and children. Put these puzzles together and then turn off the lights and reveal the glowing world. 2 progressive puzzles in 1 box with 1 extra booklet describing interesting facts of the space, dinosaurs, sea animals, forest animals, grassland animals and plants. 81 and 108 pieces bring different levels of difficulty. Come and challenge yourself. You will love the colorful artwork of these puzzles.