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Infection—which started as a fan-made multiplayer variant but eventually became a Halo staple—pits humans against zombies. For the humans to win, they've got to survive. For zombies to prevail, they've got to take out all the humans.In an interview with Game Informer , community coordinator John Junyszek and multiplayer engineer Geoff Landskov discussed the ways Infection is different in Halo 5.Many of the changes are to the maps. The devs adjusted each for gameplay optimization by adding cover, making hallways longer, and changing the tone. The "core shapes" of the maps haven't changed. "It's all Forge," Junyszek said. "It's not actual dev work on the map."The maps have a green tint, Landskov added. "They all look kind of dreary compared to their normal counterparts. It's mostly the fog and the screen-space coloring feels very different."The HUD is "basically the same," but with an added green vein effect onscreen, to ensure players know they're playing as infected characters.Among other changes, 343 isn't allowing all players to start with pistols. Allowing all players to use pistols at the start tended to keep infected characters boxed into their spawn locations."We really, really wanted to increase the movement around map and also decrease the frustration players were having," Landskov said.Alpha infected - the players who begin the match on the infected side - will also be "partially invisible," allowing those players to be a "bit stealthier" and grab the first few kills to get the mode rolling. Memories of Reach is expected to debut this month . Along with the Infection mode, the update will add a whole bunch of new REQ content to the game.

Nicole is a freelance writer for IGN. You can follow her on Twitter