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Bakugan Battle Brawlers DS: Defenders of the Core (爆丸バトルブローラーズDS ディフェンダー オブ ザ コア) is a Nintendo DS game based on the Bakugan Battle Brawlers franchise. In Japan, the game was published by Sega - elsewhere it is simply titled Bakugan: Defenders of the Core and was published by Activision. Other versions of Bakugan: Defenders of the Core for other platforms also exist, though neither of these versions were handled by Sega, nor released in Japan.