An unusual, attractive and challenging pyramid puzzle. There are 7 pcs, each one different. Each pc contains 5 balls (doweled into permanent position). Your goal is to stack the 7 pcs to form the pyramid shape. The base is a 5x5x5 triangle. We made this based on the popularity of our smaller 4x4x4 pyramid. It was designed by Mike Reilly of Flagstaff AZ.