The space battle game series we know as Halo began in 2001. Note there are seven main games, not counting reissues and remasters. Which is the best? Only those who have played all seven and compared notes would know. That said, I don't know if it would be better to introduce a game-playing child just old enough for Halo to the best of them first, or the worst and then work their way up. Get the lowdown on all the Halo games compared to each other at Unreality.