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Launched in 2012 by online media powerhouse Vox (The Verge, SB Nation) Polygon grew almost overnight to become  the leading online video game news site. Much of Polycom's success can be credited to it's team of 20 veteran editors and reporters including former editors in chief of JoyStiq, Kotaku and The Escapist.

Polygon is packed with content for serious and casual gamers alike. There are game industry news, game and game platform reviews with many videos, opinion pieces and a lively forum. Reviews can be filtered by platform (Xbox, PlayStation, Nintendo, PC, iOS or Android)

The site uses a responsive web design to support all viewport sizes, mobile and desktop. At over 5 MB, home page weight is enormous even for a desktop site. Most of that weight comes from the page's 98 images.

Mobile edition of a popular gaming and entertainment site.  IGN features news, reviews and ratings of PC, Console and mobile games; movies, music and TV programing. Source: HubPages.

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Video game news, reviews, mods, previews and  ratings from CBS Interactive's Gamspot.  Covers Mobile (iPhone & Android only), PC and console games.

Microsoft's official Xbox site lets you view your own and friend's Xbox Live Gamers Cards, download free mobile phone wallpapers, ringtones and videos, find the nearest Xbox dealer and read excerpted news of new game title releases.

Reviews covering all forms of electronic gaming including PC, console, handheld and mobile games with reviews and industry news.  

Kotaku is Gawker Network's video game news blog. The site covers PC, console and mobile gaming with reviews, product announcements and industry news.

Electronic Gaming Blog. Reviews, new game announcements, future console speculation.

A member of AOL's Weblog's familiy of entertainment and gaming blogs (JoyStiq, BigDownload, WOW), massively.com features news and reviews of Massively Multiplayer Online (MMO) games. Source Oh! Mobile Directory

G4TV is an cable TV channel (owned by Comcast) covering tech gadgets, web culture and especially video games.  The G4TV mobile site a 2009 Webby Peoples Vote winner in the Entertainment category.  The site carries gaming news, game reviews and video features.  There's also an "iPhone" version of G4tv at iphone.g4tv.com with more high candy and better quality videos.

News blog with reviews, rumors and product announcements for and about Nintendo games, the Nintendo Wii and U game consoles and Nintendo 3DS handheld gaming system.

Pocket Gamer covers games for mobile phone and handheld consoles with the latest news, previews, reviews, tips, features and practical guides for; mobile phones, PSP, DS, DS Lite, GBA and N-Gage.

Online mobile edition of South Africa based print magazine PC Format.  The site features computer game and gaming hardware news and reviews.  Source: Oh! Mobile Directory

For many years AllAboutSymbian.com's sister site, All About N-Gage has been the best place to find in-depth, honest reviews of the latest N-Gage games and news about the platform. A couple of months ago All About N-Gage was relaunched as OviGaming.  About the time of the re-branding, the mobile version of All About N-Gage more or less stopped  working.  The front page still loaded but all links led to an error page.  I'm sure the mobile site breakage was unintentional but it forced faithful N-Gage fans to use the desktop version of Ovi Gaming on their handsets to keep up with what was happening with the Nokia gaming platform. That probably wasn't a huge hardship as all the current N-Gage capable Nokia phones can handle the full site quite well, as can Opera Mini.

Eventually, OviGaming.com announced a new mobile friendly version of the site.  It's at a new URL, ovigaming.mobi. The old allaboutngage.com/mobile/ address doesn't seem to redirect to the new version. The new site has a much more modern looking, touch friendly design. It includes all the content from the desktop edition except for the forums in a nice clean single column design with finger-friendly links for 5th edition users.

If you're into games on Nokia handsets, Ovi Gaming is a must read site for its in depth game reviews and honest appraisals of the strengths and weakness of the N-Gage platform.