Design patterns are widely used in game design, especially in action games. Design patterns can be seen as a group of concluded gameplay. A stealth game is a video game genre that rewards the player for using stealth (conceal avatar of player in order to avoid enemies) to overcome antagonists. In some cases there is a conflict between difficulty and game experience in stealth game. In order to solve this problem, we researched design patterns in stealth games. We observed a set of stealth game design patterns from three different stealth games. The collection used a different template of game design pattern.Then we created a questionnaire to collect opinions from designers that have experience in stealth game area. Based on such data, we designed and created a prototype of application. Unlike other websites or books, the application shown game design pattern for a single type of game(stealth game). From the application designers can check stealth game design patterns based on design document. The application can introduce stealth game design patterns to designers, and show how to use them in stealth game design.