In its first week available, more than 1.5 million people downloaded the WWE SuperCard game, a free-to-play app that combines WWE wrestling with collectible card games. It's a big win for 2K games, announcing that WWE SuperCard is now one of the most successful free-to-play titles in the game publisher's history.

WWE SuperCard is a mobile game that lets players collect cards featuring some of the WWE's biggest stars. These cards can be used in five-versus-five online matches against other players, letting players assemble dream teams of their favorite wrestlers. The game also features a 16-person tournament mode and more than 400 cards to make up a huge roster of WWE Superstars, Divas, Legends and Managers for players to battle with. 2K promises the game will be regularly updated to expand the roster with new cards.

"In less than one week, WWE SuperCard broke 2K's records and became one of the Company's most popular free-to-play games to date," Chris Snyder, vice president of marketing at 2K, said in a press release. "WWE SuperCard is a fun, engaging and addictive game for mobile game enthusiasts, WWE fans, and card collectors alike, bringing the larger-than-life action of WWE straight to their mobile devices to engage with at home or on-the-go."

While the game is free to download, 2K is hoping at least some of the game's 1.5 million players will spend some cash on the available in-app microtransactions. The game is available to download on the Google Play store and on iTunes.

SuperCard isn't the only WWE game from 2K. The company's first next-gen wrestling title, WWE 2K15, will be released on Oct. 28 for Xbox One and PlayStation 4, as well as last-gen systems.

You can watch the first two next-gen wrestler introduction videos for Randy Orton and Goldust here, with more to come in the near future as the Oct. release date for the game creeps closer.

So far more than 40 wrestlers have been revealed for the game, with more character reveals coming soon. WWE 2K15 will feature a robust Create-a-Superstar mode as well as a historical rivalry mode. Called 2K Showcase, the mode will let players play through some of the WWE's most iconic rivalries alongside in-game cinematics and archive footage.

A limited edition "Hulkamania" version of the game including signed Hulk Hogan memorabilia is also available.

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