ABC did not program that timeslot, leaving its affiliates to do it themselves. During the week of September 8–12, 1975, The Price is Right experimented with a sixty-minute episode format, during what it called "Anniversary Week" (the third anniversary of its premiere). The Anniversary Week included a prototypical circular Showcase Showdown spinner wheel used only for that week of shows. The Anniversary Week experiment was a ratings success, and quickly led to the announcement on September 30, 1975, of the permanent expansion of The Price is Right to sixty minutes, effective November 3, 1975; its start time moved to 10:00 a.m. ET. From March 7, 1977, to November 4, 1977, The Price Is Right aired at 10:30 a.m. It then returned to 10:00 a.m. for just five weeks. On December 12, 1977, the show moved back to 10:30 a.m. and remained there until April 20, 1979, when it assumed the 11:00 a.m. ET slot where it has remained ever since. The format of the show has since remained virtually unchanged. New pricing games are generally added each year, while others are retired. In addition, prizes and pricing games have kept pace with inflation, with games originally designed for four-digit prices of prizes (most often cars) adjusted to allow for five-digit prices. While the set has seen numerous redesigns and upgrades over the years, the show has maintained a similar aesthetic element from its premiere in 1972. In season 36, CBS began offering full episodes of the show available for free viewing on the network's website. The show also began broadcasting in high definition with The Price Is Right $1,000,000 Spectacular primetime specials (the normal daytime version continued to air in 4:3 standard definition). The show made the full transition to HD broadcasts beginning with season 37. During the weeks of September 28, 2009, September 20, 2010, and October 4, 2010, two new episodes aired each weekday on CBS. In 2009, the additional episodes filled a gap between the cancellation of the daytime drama Guiding Light and the debut of Let's Make a Deal. In 2010, the extra episodes aired between the cancellation of As the World Turns and the debut of The Talk. The intervening week offered a second episode of Let's Make a Deal. The 2009 second episode aired in the timeslot vacated by Guiding Light at 10:00 a.m. or 3:00 p.m. ET/PT, depending on the affiliate's choice. In