Custom game

A Custom Game is a customizable gametype in Halo. To start customizing, you will first have to select Settings from the main menu. From there, you will choose from seven different game types. These include Slayer, Capture the Flag, Assault, King of the Hill, Oddball, Juggernaut, and Territories. After selecting your game type, you will then come to edit player options, vehicles, and weapons. You can customize things such as how much shielding players have, which vehicles appear/don't appear, as well as what weapons you can pick up during your game.

This can be done whether on local play, split-screen, or on Live.

It is the same thing as "Splitscreen" from Halo 2 or "Custom Games" in Halo 3.