One version is common, at least one other version is rare
 Game design by Massimo Magnasciutti and Paolo Costabel. Coding by Paolo Costabel. Graphics & cartoons by Massimo Magnasciutti. Music/sound FX by Marco Caprelli. Translations by Clare Walford (English), Brigitte de Froidcourt (French) and Dagmar Kaiser Gentile (German).
 Initially released in Italian in late 1992, the multilanguage version (English/French/German) of NIPPON SAFES INC. was released a few months later in 1993. Even though the multilanguage version shows "Italian" as a choice on the game language screen, it cannot be selected and is not included in the release.
 Game features the Parallaction System (i.e. the stories of the 3 main characters follow different paths, but are inextricably linked and require problems to be solved when they occasionally crossover), as well as savegame support.
 The French release of NIPPON SAFES INC. is plagued with poorly-made data script files, causing crashes in various parts of the game. A bugfixed/patched version of NIPPON SAFES INC. (French) was released by Dlfrsilver in August 2017, which allows players to complete the game with any of the 3 main characters [Source: Dlfrsilver, via message posted on EAB].
TRIVIA: Humour is a strong feature of NIPPON SAFES INC. In one part of the game, two guys (presumably the coders) drinking in a seedy club not only offer players tips and comments on how well they are performing in the game, but will moan and bitch about how someone (read: Lucasfilm) stole their idea for a game called "The Mistery of Ape Island" (see HERE). Obviously this is a delicious reference to Ron Gilbert's cult classic point 'n' click adventure THE SECRET OF MONKEY ISLAND.