Here are the 10 Most Popular Game Sites updated average of each website's Alexa Global Traffic Rank. The following list contains some of the best websites and online resources for free Pc, Mobile, Ps3, 3ds and IPod games.

Zynga:
Zynga is a provider of social game services founded in July 2007. Zynga Alexa rank Decrease 664 (December 2012), 27,000,000 - Estimated Unique Monthly Visitors.

Pogo:
Pogo.com is a free online gaming website that offers over 100 casual games like card and board games, First Class Solitaire and Monopoly to puzzle, sports and word games. POGOLLAMA.COM is ranked 3 882 897 on the internet. Here are 16,500,000 - Estimated Unique Monthly Visitors.
 
Yahoo Games:
Yahoo games is a part of this world’s famous website with full entertainment. Here are hundreds of games are available in Social Games, Arcade, Board, Card, Puzzle, Word categories. Yahoo! Games is ranked 1,340 out of 1,346 in yahoo.com. 16,000,000 - Estimated Unique Monthly Visitors.

Y8:
Play Free Games at Y8.com. Mini Flash games, HTML5 games, Android games, Shockwave 3D games, Best of all games New Games. 
Y8.com is ranked 262 and 12,000,000 - Estimated Unique Monthly Visitors.
 
BigFishGames:
Big Fish Games is a provider of Internet media delivery software and game services based in Seattle, Washington. Big Fish is proud to announce our first annual Online Games Scholarship Contest. BigFishGames is 975 - Alexa Rank. 9,000,000 Estimated Unique Monthly Visitor.

MiniClip:
Mini clip is a popular website famed for its browser-based casual games. Miniclip was founded in 2001 by two friends, Rob Small and Tihan Presbie, website that offers Play Free Online Games, puzzle games, flash games, fun games and multiplayer games. MiniClip is 543 Alexa Rank. 8,700,000 - Estimated Unique Monthly Visitors.

AddictingGames:
Addicting Games is a good online game website. website that offers contains Action, Sports, Shooting, Arcade, Puzzle, Strategy, Adventure, Life & Style and much more. AddictingGames is 1428 Alexa Rank.  7,400,000 Estimated Unique Monthly Visitors.
 
Pop Cop:
Each and every day a new game is added for players. also able to download games for free. It contains games of Shooting, Racing, puzzle, Action. Pop Cop is 1589 Alexa Rank. 6,300,000 Estimated Unique Monthly Visitors.
 
Zapak:
Zapak.com is a privately held, online gaming portal, online gaming website in India, USA, UK, Pakistan and Brazil. This website also publish the schedule and result about latest and current series of games. Zapak is 1489 Alexa Rank. 2,200,000 Estimated Unique Monthly Visitors.

FOG:
Play thousands of Free Online Flash Games on FOG.com. FOG games is a part of this world’s famous website with full entertainment. FOG is 1,936 Alexa Rank. 3,800,000 - Estimated Unique Monthly Visitors.