YDR is a document files that store replay data for Yu-Gi-Oh! Power of Chaos card game series. YDR files can be opened by either of three game editions released between 2003 and 2004: Yugi The Destiny, Kaiba The Revenge, and Joey The Passion.

YDR file format is native to games based on Japanese anime Yu-Gi-Oh!, and collectible card game of the same name. Official game products and tokens are manufactured by Konami. The game features mystical warriors fighting evil forces that manifest themselves in form of various creatures.