Director Brett Ratner has been plenty vocal about wanting to develop a movie based on the game Guitar Hero. But Activision, the company that owns the franchise, isn't going for it. "I'd really like to do it, but they're not letting me," he tells EW.com. "I expressed my interest, but because it's such a success, it's like now there's no reason to make a movie about it." Ratner is a big fan of the game, incorporating it into videos he's directed for Miley Cyrus and Mariah Carey, and he envisioned a story about a small-town kid who dreams of fame and wins a Guitar Hero competition. "The game is wish-fulfilling, everyone can be a rock star." But despite the setback, Ratner is not giving up hope. "I might prevail," he says. "I usually do."