However, I think there are some places where the instructions for dropping are not very clear, so I will add some instructions such as signs in front of the killer whale.
If you have learned the wall kick, try going back to the factory area.
At this time, we are up to the boss battle room in the factory and defeating Fiji.
If you don't know where the hidden area in the factory is, try wall-kicking in the upper right corner of the area where the conveyor belts are vertically aligned.