Some of these are probably hidden in the game’s new areas. Inside the Egg Corridor players can find an annex called the Egg Corridor Escape where you get to see the inside of the structure and shoot bugs.
NIS America fans can also find a Prinny cap in one of the secret areas in Cave Story 3D. Quote can wear this item in 3D and classic mode, which has a pixilated model.
Cave Story 3D has other surprises for players when it comes out on November 8.