King.com and its “Saga” games are increasing their hold on the Facebook charts — the developer’s newest title, Pyramid Solitaire Saga is its fifth in a row to break the 1 million daily active user threshold.

While Pyramid Solitaire Saga isn’t the fastest  ”Saga” game to reach 1 million DAU — Candy Crush Saga reached the milestone a week faster — King.com tells us the game is its fastest-growing game among U.S. audiences. According to King.com, the game’s traffic boosters are fairly evenly divided between viral posts, cross-promotion from other King.com games and the standard Facebook marketing channels. The developer tells us viral sources are fueling the biggest chunk of Pyramid Solitaire Saga’s success, but declined to share exact numbers with us.

Player acquisition also comes from the developer’s games portal, even though King.com’s games outside of Facebook are designed to be more fast-paced  than the by the “Saga” games on the social network. King.com tells us Facebook is one of the largest acquisition channels for the  games portal; this isn’t too surprising, considering King.com’s games have regularly appeared on our Top 25 games lists ever since it debuted Bubble Saga on the social network in April 2011.

Pyramid Solitaire Saga continues to prove how successful solitaire games can be on Facebook, where three out of the top 10 card games on the platform belong to the subgenre. The game is now the No. 3 card game on Facebook, surpassed only by Zynga’s Texas HoldEm Poker and DoubleDown Interactive’s DoubleDown Casino. King.com tells us  there isn’t much of player crossover between the casino games and Pyramid Solitaire Saga, though, and it doesn’t have to worry about competing with these titles for user numbers.