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

<P0-S0> Official U.S. PlayStation Magazine (often abbreviated to OPM) is a now-defunct monthly video game magazine, published by Ziff Davis Media. <P0-S1>  It was a sister publication of "Electronic Gaming Monthly". <P0-S2>  The magazine focused exclusively on PlayStation hardware, software, and culture, covering the original PlayStation, PlayStation 2, PlayStation 3 and PlayStation Portable. <P0-S3>  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. <P0-S4>  The magazine was produced for nearly ten years, from October 1997 to the final issue in January 2007. <SEP> <P1-S0> 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. <P1-S1>  A preview issue was released at E3 2001, with another preview issue in November 2001. <P1-S2>  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. <P1-S3>  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. <P1-S4>  As of January 2012, OXM no longer includes a demo disc. <P1-S5>  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". <P1-S6>  In February 2015, "OXM" and all of Future's websites were redirected into GamesRadar. <P1-S7>  The magazine itself continues to be published in the UK, US and Australia. <SEP> <P2-S0> PlayStation Underground is a now-defunct American video game magazine, originally published by Sony Computer Entertainment America. <P2-S1>  The magazine focused on PlayStation fanbase, including gaming on the original Sony PlayStation and the PlayStation 2. <P2-S2>  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. <P2-S3>  The magazine released its first issue on March 26, 1997 and ended with its final issue in 2001. <P2-S4>  The Magazine released a total of seventeen issues during its active years. <P2-S5>  The magazine was eventually merged with "Official U.S. PlayStation Magazine" in 2001 when it was discontinued. <SEP> <P3-S0> Game Informer (GI) is an American monthly video game magazine featuring articles, news, strategy, and reviews of video games and associated consoles. <P3-S1>  It debuted in August 1991 when FuncoLand started publishing a six-page magazine. <P3-S2>  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. <P3-S3>  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. <P3-S4>  "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.