Back-up in Arms is a Weekly Event game mode in Plants vs. Zombies: Battle for Neighborville. It is a variant of Turf Takeover where players can only play as the Support classes: Sunflower and Rose on the plants team or Scientist and Engineer on the zombies team.
This game mode functions identically to Turf Takeover, except that a limited number of classes are available. You can only play as the Support classes: Sunflower, Rose, Scientist, and Engineer.
The plants and zombies send their support classes to face off in a breathtaking battle of the buff-givers!