It's simple. A gamemode where the point is that a set amount of teams have to scavenge the map looking for a randomly spawned amount of items. These items include scrap metal, gas tanks and car engines. You could choose with RTB prefs on how much of each item spawns each round.
The team that gathers the most after everything is picked up wins. In order to 'take' the item, you have to go back to go click on a special brick which adds to your team's points for the round. When killed, you drop all the items you picked up.