Epic grand strategy role-playing game Crusader Kings 3 is one of the best PC games in a generation. In our review, we described it as an elastic storytelling engine — one that rewards improvisation, while also heaving in a hefty amount of randomness. But, at its core, the game is a simulation custom-made to allow players to explore alternate histories. That includes letting them tinker with the sexual and religious norms common to the feudal world.