This is a infection gametyp with the goal to throw fire granades to the uninfected Too much chily map: Bungie.net : Halo 3 File Details Too much chily gametyp: Bungie.net : Halo 3 File Details screenshot:
Well...One picture doesn't say much about the map, I'm sure it's fun, but with one picture it's hard to tell I suggest having more info and pictures to describe your map.