Mobile game developer SundayToz (CEO Jeong-Seop Kim, www.sundaytoz.com) today announced the Asia release of its latest mobile puzzle game, 'BT21 POP STAR.'. 'BT21 POP STAR' is a mash-up puzzle game where players not only can beat intensive levels but also collect and raise 'BT21' characters: KOYA, RJ, SHOOKY, MANG, CHIMMY, TATA, COOKY, and VAN. Players can also use each character's special skills to complete levels and watch various reactions and dialogues based on the game story.. Also, the ga