Cladun: This is an RPG, known in Japan as Classic Dungeon: Fuyoku no Masōjin (クラシックダンジョン 〜扶翼の魔装陣〜, Kurasshiku Danjon ~Fuyoku no Masōjin~, lit.

"Classic Dungeon: Assistance of the Devil Formation"), is a 2010 action role-playing video game developed by System Prisma and published by Nippon Ichi Software (its parent company) for the PlayStation Portable.

The game was released in Japan on February 18, 2010, in North America on September 20, 2010 and in Europe on November 17, 2010.

[1][2] Dungeons are randomly generated and the game features customization of not only the main character but also the final boss.

Developer Souhei Niikawa compares the game's retro art style to What Did I Do to Deserve This, My Lord?, another Nippon Ichi title.