ONE is a Visual Novel that tells the story of Sketch Turner, a struggling comic book artist who finds himself trapped within his own comic book creation. After a lightning storm brings his cartoon villain Mortus to life, Sketch must navigate through the pages of his comic book to defeat Mortus and free himself.
The gameplay in ONE takes place within the confines of the comic book world, where players control Sketch as he battles through levels. With a variety of attacks and items at his disposal, including his trusty rat sidekick Roadkill, Sketch must use strategy to overcome enemies and obstacles.
The game features a linear progression through each page of the comic book, with opportunities for secret paths and alternate routes to be discovered. At the end of each level, players receive a superhero rating based on their performance, adding an extra layer of challenge and replayability to the game.