Great Minds Aristotle's Number Classic Wooden Puzzle 1. Just one piece from the Great Minds puzzle range. Will you be able to master this challenging wooden brainteaser 2. Aim: Can you make every row add up to 38 3. There are 15 rows in all directions to complete, each made up of 3, 4, or 5 pieces. This brilliant concept allows you to complete the puzzle by using every number from 1 to 19 4. Inspired by The Greek thinker Aristotle 5. Recommended for Ages 8 year and up