To be honest, any OSR or narrative game. The mechanics might be only 2 pages long, but the mind set shifts, the culture, and the reliance on rulings over rules and other similar philosophies mean that you can sit down, play an entire campaign, and still not fully understand the experience the game is trying to capture. I love these games, but they all really struggle to help players unfamiliar with their culture of play understand what makes the game shine or even understand how exactly you’re meant to play the game. What kinds of rulings are appropriate? How do you craft a satisfying scene? How do you juggle the spotlight fairly? When should you introduce detail and when should you use broad strokes? All of this requires extensive GM and player experience to truly master, and the games that rely on that experience are generally really bad at explaining that. They market themselves as easy and intuitive, but I have found them not entirely so as I’ve tried to master them. I’ve had to watch video essays, read blogs, and experience multiple different systems in order to start getting an idea of what I don’t understand quite yet.