Nagagutsu o Haita Neko

Nagagutsu o Haita Neko: Sekai Isshuu 80 Nichi Dai Bouken
Developer: Shouei System Publisher: Toei Animation Platform: NES Released in JP: November 21, 1986 This game has a hidden developer message. This game has hidden developer credits.

Nagagutsu o Haita Neko: Sekai Isshuu 80 Nichi Dai Bouken is an action game starring Toei Animation's mascot Pero the Cat. It's based on the classic story Around the World in Eighty Days. Four years later, the game would be heavily reworked and released in the US as Puss N Boots: Pero's Great Adventure.

Hidden Text

The beginning of the ROM contains this small string, which is used as RAM signature to determine if the game was soft-reset:

Masahiro

There's also some hidden copyright/credits text inside the ROM at 0xEC10 (it appears edited here; the lines were originally separated with periods):

Program and Audiovisual Copyright 10/01/86 Shouei System
Programmed by
Masahiro "ACTOR" Yoshihara
Yasuhide Sakakura
Pictured by
Kenichi "RINA" Suzuki
Makoto "TIYA TIYA PIRAYASHIMUN" Higa
Naomi "PUTTSUN" Satoh
Music by
Kaori "LIONS" Aoki
Ochakumi by
Kyouko "MADONNA" Yoshino
Mie "UMBRELLA" Takano

and at the end of copyright message some other:

WATASHITACHINIAI WO KUDASAI ..

COPY SURUNA ! Kono kurou wo wakattene !

which means "PLEASE, LOVE US, DO NOT COPY! Try to be in our shoes!".