Night of the Knights (騎士たちの夜 Kishitachi no Yoru) is the fourth episode of Phi Brain: Kami no Puzzle Season Two and the twenty-ninth episode of the anime series overall.
During the night, the members of the Orpheus Order meetup to receive a message from their leader, Klondike. Meanwhile, as Cubic deduces the recent Orpheus Rings are modernized replicas of the ancient artifacts, Gammon discovers spots Miharu with an Orpheus Ring and confiscates it from her, along with a note directing Kaito and co. to a stadium. There, they find the Orpheus Order, who reveal they are experimenting by using the replicas to collect data for building an authentic ring so they can distribute it across the globe to awaken humanity's true potential. The Order's secretary, Whist, then pits Kaito, Gammon, Cubic and Ana in a puzzle match against the Order's Pinochle, Mizerka, Doubt and Melancholy, revealed to all possess authentic Orpheus Bangles, with the losing team becoming electrocuted. In a puzzle to gain the most colored squares, Kaito manages to set things up for Gammon to bring things to a tie so no one gets electrocuted. As the Orpheus Order leaves, they again make reference to some part of Kaito's past which still eludes him.