Halo 2 is a bigger, better and more varied and interesting Halo 1. It evolves the sandbox with amazing new weapons like the Energy Sword, there are a lot more sprawling levels like the first maps of CE, and ones that are a bit more tighter feel tense and immersing. The whole Arbitre story line is a brilliant and unexpected addition that fleshes out the world and adds more interest to Halo 2's antagonists. The game is pretty as it is, but the Anniversary edition, unlike the first game's remaster treatment, improves the visuals tenfold. It's issues like the presistant hitscans or annoying boss battles are frustrating, but the whole of Halo 2 is definitely bigger than the sum of it's parts