I created DBAdventure, a massive multiplayer online role playing game developed with PHP4 and MySQL where players could choose characters from the famous Dragon Ball manga.
In a giant map all players could be warrior, thief, healer or wizard, with specific spells and attacks. They could join a guild, build buildings, buy stuffs, personalized their characters, etc...
The number of players increased up to almost a thousand players. Having between 100 and 150 players online per day.
Created in december 2004 it's unfortunately no longer online since April 2012 due to a lack of motivation and hosting costs.