Using Door Pong is super easy. First, find a suitable doorway. Open the clamp, which can open up to 9 inches wide, and attach it firmly to the top of the doorway. Then, turn the dial on the clamp to adjust the string to your preferred length. You can play with a friend, taking turns to hit the ball back and forth, or play solo. Your goal is to keep hitting the ball without missing. When you're done playing, remove the clamp from the doorway gently. To keep Door Pong in good condition, store it in a dry place away from direct sunlight. Avoid pulling the string too hard or hitting the ball with excessive force as this could damage the equipment. Check the clamp regularly to make sure it's still in good working order, and if the ball or paddles get dirty, you can clean them with a soft, damp cloth.