"2013-03-25Z"^^ . . "1929-11-13Z"^^ . . "2014-09-02Z"^^ . "Warframe is a free-to-play cooperative third-person shooter video game developed by Digital Extremes for Microsoft Windows, PlayStation 4 and Xbox One. Although the game is free to download, players may purchase in-game currency called \"Platinum\"."@en . . . . . .