Question:  PlayStation Underground was eventually merged with "Official U.S. PlayStation Magazine", a now-defunct monthly video game magazine, published by who?

PlayStation Underground is a now-defunct American video game magazine, originally published by Sony Computer Entertainment America.  The magazine focused on PlayStation fanbase, including gaming on the original Sony PlayStation and the PlayStation 2.  Unlike its paper-based counterpart the "Official U.S. PlayStation Magazine", PlayStation Underground came in the form of CD-ROMs which could be played on the PlayStation and PlayStation 2 consoles.  The magazine released its first issue on March 26, 1997 and ended with its final issue in 2001.  The Magazine released a total of seventeen issues during its active years.  The magazine was eventually merged with "Official U.S. PlayStation Magazine" in 2001 when it was discontinued. <SEP>  It was a sister publication of "Electronic Gaming Monthly". Official U.S. PlayStation Magazine (often abbreviated to OPM) is a now-defunct monthly video game magazine, published by Ziff Davis Media.  The magazine focused exclusively on PlayStation hardware, software, and culture, covering the original PlayStation, PlayStation 2, PlayStation 3 and PlayStation Portable.  Perhaps the most famous aspect of the magazine was the inclusion each month of a disc that contained playable demos and videos of PlayStation games.  The magazine was produced for nearly ten years, from October 1997 to the final issue in January 2007. <SEP> Game Informer (GI) is an American monthly video game magazine featuring articles, news, strategy, and reviews of video games and associated consoles.  It debuted in August 1991 when FuncoLand started publishing a six-page magazine.  The publication is owned and published by GameStop Corp., the parent company of the video game retailer of the same name, who bought FuncoLand in 2000.  Due to this, a large amount of promotion is done in-store, which has contributed to the success of the magazine; it is now the 4th most popular magazine by copies circulated.  "Game Informer" has since become an important part of GameStop's customer loyalty program, Power Up Rewards, which offers subscribers access to special content on the official website. <SEP> Official Xbox Magazine (or OXM for short) is a monthly video game magazine which started in November 2001 around the launch of the original Xbox.  A preview issue was released at E3 2001, with another preview issue in November 2001.  The magazine was bundled with a disc that included game demos, preview videos and trailers, and other content, such as game or Xbox updates and free gamerpics.  The discs also provided the software for the Xbox 360 for backward compatibility of original Xbox games for those without broadband and Xbox Live access.  As of January 2012, OXM no longer includes a demo disc.  In mid-2014, the U.S. version was merged into the UK version on the website, which lasted only a few months until Future plc announced that it was closing its website along with all the other websites that Future has published, including "Edge" and "Computer and Video Games".  In February 2015, "OXM" and all of Future's websites were redirected into GamesRadar.  The magazine itself continues to be published in the UK, US and Australia.