DES MOINES, Iowa — Starting Monday, the Powerball lottery will be adding a third drawing each week. Powerball administrators hope the new Monday drawing will lead to larger prizes and increased sales.Powerball is also adding a new feature called Double Play. It costs $1 extra and gives players a second chance to match their Powerball number in a second drawing with a top cash prize of $10 million. Double Play tickets are eligible to win both prizes.