A debug room can be accessed using GameShark codes, which features some testing tiles, and a Japanese voice track, which when translated reads:
"Hi, I'm Joji Yanami. I'm not a young man anymore. I've done this job for a long time. Eyup. I've done a lot of stupid roles. Man, though, this year has been so hot, I could die. It's way too much... I'm an old man, you see. I can't do anything anymore. It's exhausting. Someone save me, please. It's already September. I think something will come of all this, maybe. Old age is old age. Maybe not, though. Yeah. Well, that's all. See you, then."