Custom Robo (GameCube) – There Is No Amusement Park Area

Custom Robo (GameCube, 2004) does not contain an amusement park map, level, or accessible area. You may be confusing it with:

• Custom Robo Arena (DS) – Has a "Robo Cup" tournament hub with distinct visual areas, but no park
• Pokémon Colosseum / XD – Phenac City has a fountain/plaza area; Pyrite Town has a cave/colosseum
• Animal Crossing (GC) – No amusement park (City Folk later added city)
• Chibi-Robo! – House/garden only
• Mario Party 4–7 – Several boards are theme-park themed (e.g., Mario Party 5 "Dream Depot")

Custom Robo GC Actual Locations

• Hero's House / Neighborhood
• School (classroom, roof, gym)
• Police Station
• Underground Lab
• Robo Command Center
• Final Boss Arena (Z-Syndicate Base)

If you're stuck on a specific mission, describe the objective or enemies – I can give a walkthrough. Otherwise, the "amusement park" doesn't exist in this game.