Katamari Damacy Online ~Roll it! Prince!~ was a Korean game and the first game developed by Blue Bird Studio; a division of Windysoft (now known as JUNEiNTER). Katamari Damacy Online was opened for beta testing late 2007 and ran for around 4-5 years, shutting down on February 24, 2012. The game started with many beta tests before being officially released. Not a lot of information was recorded during it's lifespan, but there exists still news articles and recordings of gameplay.

Katamari Damacy Online had multiple maps, including stages from previous games (such as the CowBear level from We Love Katamari). Multiplayer maps were also reused from the Playstation 2 and Playstation Portable Katamari games. There were supposedly also minigames for the players available.