Halo 2 improves a lot about what I liked about Combat Evolved while adding a lot more meat to areas that I thought needed it. The big improvement comes from the story. Combat Evolved had a story, though it wasn't what I was mainly looking forward to for the most part. I knew Halo had some good lore, and Combat Evolved had some interesting parts but that wasn't the highlight for me (though the Keyes mission was really good). In Halo 2, the story takes more importance, even going as far as to have a second playable character and that was a really cool perspective. The other elements of the game are also improved like the level design, music, and graphics, though I feel like some missions were a little weaker than in Combat Evolved (though that's a minority of missions). Still, I had a lot of fun playing this and it definitely was a step up from Combat Evolved, though I wouldn't say it's perfect, just really great. Overall, very great game with improved elements to its predecessor.