Did anybody won a slender game?

As of my last update, there hasn't been a widely recognized or official competition known as a "slender game" that declares winners. However, various fans and players have created their own challenges or competitions related to the Slender Man mythos and games inspired by it, where individuals may share their experiences and achievements. These are typically informal and not tracked on a larger scale. If you are referring to a specific game or competition, please provide more details for a clearer answer.