Nippon Safes Inc. is a single-player adventure game that combines graphic adventure and point-and-click mechanics, where players control one of three characters to explore environments, solve puzzles, and progress through the story. In this game, set in Tokyo, players follow the stories of Doug, Dino, and Donna, each with their own unique narrative and objectives, as they navigate the city and uncover various humorous situations. It stands out with its cartoonish, comic-style graphics, a distinctive icon-based interface, and a non-linear plot structure that allows players to choose the order of character playthroughs, culminating in a final scene featuring all three characters together. The game emphasizes Italian humor and a comedic tone over crime or mystery themes.