The Learning Journey Puzzle Doubles Glow in the Dark SpaceLearning about Outer Space has never been so much fun! After assembling the 100 piece puzzle, turn off the lights and watch it glow in the dark! Puzzle Doubles! Glow in the Dark! puzzles are a fun way to expand your knowledge of different environments and launch your little one's interest in the solar system. The puzzle measures a giant 3 x 2! Ages 3+ years.