Video games are a growing content industry worldwide. To play a new game, a user must understand and operate its unique elements. Although tutorial systems help users understand the unique elements within a game, existing tutorial systems temporarily stop the game’s progress and use part of the screen for explanations, reducing the user’s sense of immersion in the game. Herein we propose a method for a tutorial system that provides instantaneous access to the information while maintaining an immersive experience by displaying the tutorial system on a different screen such as a smartphone. To confirm the effectiveness, we implemented the proposed method on a Windows game written in C++ and conducted an evaluation experiment. We built tools into the game that retrieve the game’s status and present the appropriate information. We also created an Android application that receives the information sent by the program and displays it on a smartphone. The questionnaire results demonstrate the effectiveness of the proposed method.