The Deluxe Edition mod is a fan-driven overhaul of the PS2 classic. It is not an official release by Bandai Namco, but rather a community-driven project designed to pack the game with content that was either impossible to fit on the original disc or wasn't envisioned at the time of development.
The mod is designed to be accessible for both long-time fans and newcomers: dragon ball z budokai 3 deluxe edition mod exclusive