text: Though the game was technically completed within a year, PopCap opted to spend more time polishing it, improving the visuals and background images. The team worked on refining the various sound effects used in the game to provide an appropriate atmosphere. In some cases, they found the desired sound quickly; the sound of the ball hitting a peg was borrowed from another game in development at PopCap but was considered perfect for Peggle. Other cases required iteration; the sound of the ball shooter was originally closer to that of a cannon, while a "plunk" sound effect was used when the ball catcher caught a ball. These were changed to more airy sounds (an air cannon and a brief angelic chorus) to make the elements sound as if part of the game's music. The team found that it helped to create a defining moment at the end of each level when the player is moments from clearing the final peg. This feature initially was programmed as a simple message stating "Extreme Fever" and the music of "Ode to Joy" as a placeholder. Sidhu wanted to recreate the "wild sounds and visuals" present in winning pachinko games. However, the team found that the players reacted well to the simpler placeholder elements. The team focused on improving the presentation of these, including adding a zoom on the current ball as it neared the last orange peg to be cleared.
  PopCap was granted a patent in the US for the gameplay of Peggle as an "Electronic game, such as a computer game involving removing pegs" in 2014.