Extract the game data from the Chrono Cross disc image or dump
Locate the world map-related files in the extracted data
Use a Chrono Cross modding tool or hex editor to inspect the map data
Identify the world map geometry, textures, and event data
Edit the map coordinates, terrain layout, or object placements with the appropriate tool
Modify associated collision data if the map changes require it
Update any linked scripts, triggers, or warp points
Rebuild the game image or patched files after editing
Test the modified world map in an emulator or on hardware
Repeat adjustments until the map behaves correctly