Split-screen
From Halopedia, the Halo wiki
On most video games, there is a multiplayer mode called Split Screen. Split Screen is only available if there are 2-4 people playing on one video game console. On Halo 1(Combat Evolved), Halo 2, and Halo 3 the screen is split horizontally, unless there are 4 people, then it is split into 4 equal sized screens. On some games, the screen is split vertically.
