Question: What game is operated by Mansion (Gibraltar) Limited, that has been partly responsible for a huge increase in poker players worldwide?

Context paragraphs:
888poker: 888poker. com is the second largest online poker network in the world and the second most popular online poker brand as of December 20, 2013.  888poker. com is operated by 888 Holdings plc subsidiary Cassava Enterprises Ltd under the laws of Gibraltar.  888poker was launched in 2002, offering players traditional poker games such as Texas Hold'em, Omaha poker, and Seven-Card stud.  Avi Shaked owns roughly 50% of 888 Holdings through family trusts, while Shay and Ron Ben-Yitzhak own 11%, also through a family trust.

Poker Hall of Fame: The Poker Hall of Fame is the hall of fame of professional poker in the United States.  Founded in Las Vegas, it was created in 1979 by Benny Binion, the owner of the Horseshoe Casino, to preserve the names and legacies of the world's greatest poker players and to serve as a tourist attraction to his casino.  Binion was known for the creative ways in which he marketed his casino.  In 1949, he convinced Johnny Moss and Nick "The Greek" Dandolos to play high-stakes poker heads up where the public could watch them.  In 1970, he invited a group of poker players to compete in what would be the first World Series of Poker (WSOP).  When Harrah's Entertainment, now known as Caesars Entertainment, acquired the rights to the WSOP in 2004, it also assumed ownership of the Poker Hall of Fame.  Currently, membership in the Poker Hall of Fame is handled directly by the WSOP.

Online poker: Online poker is the game of poker played over the Internet.  It has been partly responsible for a huge increase in the number of poker players worldwide.  Christiansen Capital Advisors stated online poker revenues grew from $82.7 million in 2001 to $2.4 billion in 2005, while a survey carried out by DrKW and Global Betting and Gaming Consultants asserted online poker revenues in 2004 were at $1.4 billion.  In a testimony before the United States Senate regarding Internet Gaming, Grant Eve, a Certified Public Accountant representing the US Accounting Firm Joseph Eve, Certified Public Accountants, estimated that one in every four dollars gambled is gambled online.

Mansion.com: Mansion (Gibraltar) Limited is an online gambling company that operates online casino and poker websites.  The company was founded in 2003 and has its headquarters in Gibraltar.

Mark Vos: Mark Vos (born 20 October 1983), also known as 'pokerbok', is a professional poker player from Australia.  Vos was born in Cape Town, South Africa, and attended Waldorf High School in Constantia.  He excelled at mathematics olympiads while in high school, and represented his province in the interprovincial olympiad.  Vos permanently deferred his actuarial studies at Macquarie University, to play poker full-time.  Starting out online with limit hold'em in mid-2004, Vos soon turned his attention to no-limit games, and in short time, earned a reputation as being one of the world's top online poker players, such that he can often be found playing in the most expensive cash games and tournaments online.  When not travelling the world playing poker, Vos plans to divide his time between Australia and South Africa.  In January 2006, Vos finished 8th in the main event of the Crown Australian Poker Championship, winning A$83,600.  As of May 2006, Vos represents the Full Tilt Poker online poker cardroom as a friend of Full Tilt Poker.  His name is reflected in red on Full Tilt tables.

Poker Players Alliance: The Poker Players Alliance (PPA) is an American nonprofit Interest group formed to emphasize the rights of poker players, and to protect the players' liberties."  The PPA formed to serve as an advocacy group to Washington to establish rights and protections for U.S. poker players.  Within the first year of its existence, the PPA garnered over 600,000 members.  In April 2008, the PPA claimed to have signed up its one millionth member.  Membership growth has been due in part to promotional activities by online poker cardrooms like Party Poker.

Slashdot effect: The Slashdot effect, also known as slashdotting, occurs when a popular website links to a smaller website, causing a massive increase in traffic.  This overloads the smaller site, causing it to slow down or even temporarily become unavailable.  The name stems from the huge influx of web traffic which would result from the technology news site "Slashdot" linking to websites.  The name, however, is somewhat dated, as flash crowds from "Slashdot" were reported to be diminishing as of 2005 due to competition from similar sites.  The effect has been associated with other websites or metablogs such as Fark, Digg, "Drudge Report", Imgur, Reddit, and Twitter, leading to terms such as being "farked" or "drudged", being under the "Reddit effect"—or receiving a "hug of death" from the site in question.  Google Doodles, which link to search results on the doodle topic, also result in high increases of traffic from the search results page.  Typically, less robust sites are unable to cope with the huge increase in traffic and become unavailable – common causes are lack of sufficient data bandwidth, servers that fail to cope with the high number of requests, and traffic quotas. Sites that are maintained on shared hosting services often fail when confronted with the Slashdot effect.

The Biggest Game in Town: In 1983, Al Alvarez published, The Biggest Game in Town, a book detailing the 1981 World Series of Poker event.  The first book of its kind, it described the world of professional poker players and the World Series of Poker.  It is credited with beginning the genre of poker literature and with bringing Texas Hold'em (and poker generally), for the first time, to a wider audience.

The Professor, the Banker, and the Suicide King: The Professor, the Banker, and the Suicide King: Inside the Richest Poker Game of All Time (ISBN  ) is a 2005 book by Michael Craig detailing billionaire Andrew Beal's series of high-stakes poker games with Las Vegas' top professional poker players.  The book title refers to some of the professional players involved in this series.  The Professor is mathematical poker mind Howard Lederer, the Banker is Andrew Beal himself, and the Suicide King is crazy, sometimes reckless player Ted Forrest.  It also refers to the King of Hearts, since on the card the King's sword appears to be put in his head.

Annie Duke: Anne LaBarr "Annie" Duke (née Lederer; September 13, 1965) is an American professional poker player and author.  She holds a World Series of Poker (WSOP) gold bracelet from 2004 and used to be the leading money winner among women in WSOP history (a title now held by Vanessa Selbst).  Duke won the 2004 World Series of Poker Tournament of Champions and the National Heads-Up Poker Championship in 2010.  She has written a number of instructional books for poker players, including "Decide to Play Great Poker" and "The Middle Zone", and she published her autobiography, "How I Raised, Folded, Bluffed, Flirted, Cursed, and Won Millions at the World Series of Poker", in 2005.

Supporting paragraphs: Mansion.com Online poker
Answer: Online poker