game developers included new features in their products. For example, Rock Band 3 and Power Gig: Rise of the SixString support guitar controllers with strings, and both contain modes that teach players accurate fingering. Despite this new content, sales of music games faltered in 2010. Guitar Hero: Warriors of Rock and DJ Hero 2 sold only 86,000 and 59,000 copies, respectively, in North America during their first week on the market. This was in sharp contrast to Guitar Hero III, which had sold nearly 1.4 million units in its first week in 2008. Through October 2010, music games achieved net sales of around $200 million, one-fifth of the genre's revenue during the same period in 2008. Analysts believed that the market likely would not break $400 million in revenue by the end of the year. End year sales were less than $300 million. By the end of 2010, the instrument controller-based rhythm market was considered "well past its prime", and developers shifted their focus to downloadable content and potential integration with motion control systems. In late 2010, Viacom sold Harmonix to an investment-backed group and allowed it to continue developing Rock Band and Dance Central. Citing the downturn in rhythm games, Activision shuttered their Guitar Hero division in February 2011. Analysts suggested that the market for peripheral-based rhythm games may remain stagnant for three to five years, after which sales could resurge because of digital distribution models or the release of new video game consoles. However, by 2013, the era of peripheral-based music games was considered at an end, as Harmonix announced that it would cease regular updates of Rock Band downloadable content on April 2, 2013 as the company shifts to newer games. Rhythm games for young girls (2004–present) In Japanese amusement arcade, arcade-based collectible card games became popular. In 2004, Sega released Oshare Majo: Love and Berry which was a fashion coordinate game with collectible card game and rhythm game elements. The Oshare Majo was a big hit in Japan and then other game companies also entered in this game genre. Sega – Oshare Majo: Love and Berry (2004–2008) and LilPri (2009–2011) Taito – (2006–2007) Atlus – Kirarin Revolution: Happy Idol Life (2006–2009) and Gokujō!! Mecha Mote Iinchō: KuruMote Girls Contest! (2009–2011) Tomy – (2006–2010), Pretty Rhythm (2010–2014), PriPara (2014–2017), Idol Time PriPara (2017–2018), Kiratto Pri Chan (2018–2021) and Waccha PriMagi! (2021–) Bandai – Pretty Cure: Data Carddass