GamersInfo writes: "There's a story to go along with all of the logic puzzles, but you have the option of skipping it if you'd rather focus on problem solving. The story itself has amusing dialogue and character interactions, and there is a different ending for each character. There are about 20 hours of gameplay if you go through the storyline, but almost endless replayability with the puzzles (my friendly Natsume guide claimed to have spent 70 hours (!!!) on the game). You can even link up to your friends to battle locally using the DS' wireless feature".