Custom Robo Arena

The game's Japanese title means "Rumble Custom Robo", by the way.

Chapter Select
A debug menu for a chapter select can be re-enabled with Action Replay codes.

For the European version, after entering the code start a new game or press Start + A on a menu. 02000DEC E3A09001 94000130 000002F7 220CF810 00000000 D2000000 00000000