Video game movies are sometimes mocked for forcing dramatic story arcs onto things that are essentially non-narrative, like the endless shooting gallery of Doom, or the physics puzzles of Angry Birds. Assassin’s Creed, a game franchise that launched in 2007, is an intensely cinematic series about the generational conflict between two warring secret societies. A Hollywood adaptation needs to feel like more than an extremely truncated live-action remake — and when Assassin’s Creed manages to do so, it’s by going smaller, not bigger.