LOS ANGELES - Ndoors Interactive, a leading publisher of multiplayer online games, today announced that pre-paid cards for Ndoors' free-to-play titles are now available at GameStop. Available in $10 and $25 denominations, the pre-paid cards provide an additional payment option for players who wish to shop in the item malls in Atlantica Online, Luminary: Rise of the GoonZu and WonderKing. "We strive to offer our gamers a premium experience that is both enjoyable and convenient," said Peter Kang, CEO of Ndoors Interactive. "Offering our cards in GameStop allows our players the opportunity to purchase our cards at thousands of new locations with the largest game retailer in the world." The pre-paid cards enable gamers to customize their in-game characters with special items, weapons, armor, and equipment. All of Ndoors' games are 100 percent free-to-play.