Dungeon Dice Monsters Online was started a little while after Duel Monsters Online in October of 2003, the project was put on hold because DMO took up so much time.
Over the next 18 months I worked on it when I had a few minutes, nothing consistant. Just writing down a few ideas now and then.
In May 2005, Lufia took an interest in the project as encouraged me to work on it again. DMO 4.1 was pretty much finished and the Duelist Kingdom was complete, so I decided to take it back up again.
On June 6th 2005 we decided to host a preview of DDMO. At this time the internals systems were done and we were ready to move into beta and start adding to it.
The project was announced and work continued.

January 2006. With the release of Lufika.com we were able to begin hosting the first version of DDMO permanently, this version was a complete game with 124 dice and 3 duel modes as well as an interactive tutorial.
Later, 6 new dice were added and an option for obstacle dueling was included, this completely changed the strategies of the game and introduced some exciting new possibilities.