|Name of the file: Grandia Xtreme - Author: ANO - [PSX]|
After gaining access to the Starlight Park, return to the various ruins and proceed to the end of each. You will find a Boss or group of Bosses to defeat. It is recommended that you be at level 30 or higher.
After you beat the game, you'll be prompted to save your game, do this and then reenter your game, the bonus dungeon with 100 floors will be available on the map.