Assassin's Creed IV: Black Flag is the next game to headline the PSN 12 Deals of Christmas promotion. In the latest deal, the PS3 version of Black Flag is now only £19.99 for the next 48 hours. The latest Assassin's game is also joined by a PS Vita title, which today comes in the form of Pixeljunk Monsters: Ultimate HD, which is now just £3.99.