Get ready to challenge your brain with these innovative logic puzzle sets. The starter set includes 77 challenging puzzles specifically designed for ages 7 and up to solve. Created for independent problem solving, these puzzles are designed without words to encourage inferential and creative thinking. Kids can see if they got their answers correct by plugging in the included wooden peg into one of the puzzle case s bottom four holes. If the card can pull out of the case, then the answer is right, if not, keep working! Designed for on-the-go learning and travel.