Phi Brain: Puzzle of God (ファイ・ブレイン 神のパズル, Fai Burein Kami no Pazuru) is a 2011 Japanese anime television series produced by Sunrise. A manga adaptation by Yoshiki Togawa was serialized in Kadokawa Shoten’s Newtype Ace magazine. Kaito, a puzzle-loving high school freshman, is selected as a candidate for “Phi Brain”. He finds an “unsolvable puzzle” near their school, which turns out to be a life-threatening “philosopher’s puzzle” created by the mysterious group P.O.G. (Puzzle Of God).