I've built dozens of outdoor games like this, and a reliable template ensures precise, even cuts every time. Using a circular or miter saw, cut two scrap wood pieces at a 35-degree angle. Secure them to a 4-1/2" wide board with wood screws so the angled edges align perfectly to guide your cuts.
Measure and cut the pipes to these exact lengths (from the highest point):
Row 4: four pieces at 6-1/2"
Row 3: three pieces at 10"
Row 2: two pieces at 13-1/2"
Row 1: one piece at 17"
Position the mark on the template's lowest edge and use a hand saw for angled cuts. Measure from the remaining straight edge for the next piece. Repeat to get all 10 pipes cut accurately—no wasted material.
Arrange the pipes in a pyramid on a flat surface, tallest at the back. Mark intersections with a marker, then draw lines along each pipe. Measure from the flat edge for hole positions:
Row 4: 3" for all holes
Row 3: 3" front, 5" sides, 7-1/2" back
Row 2: 7-1/2" front/sides, 9" back
Row 1: 9" front
Drill at each mark, double-checking alignment as you progress for a sturdy build that lasts seasons of play.
Tape inside edges and stuff holes with paper to protect them. Spray each row a vibrant, distinct color. Pro tip: Paint a stick for the throwing line and match tennis balls to rows for added fun.
Apply vinyl stickers with points along the top inside edge: 100 for the top row, 50 for row two, 25 for row three, and 10 per pipe in row four.
Stack the pipes and bolt through the holes. Hand-tighten all nuts for a secure, wobble-free structure ready for action.
Position the throwing line stick 6-15 feet away—the farther, the tougher. Players stand behind it for three tosses per turn. First to exceed 100 points wins endless backyard entertainment!