How about a Juggernaut type mode? I know this game is an odd place for it, but I think it would be fun to pit a team against 1 very powerful, absurdly high ink capacity, super high HP, fast moving, large character who shoots out massive ink bullets. It can play like a turf war, but the juggernaut has several advantages. I also think some kind of race could be fun. You would have to make a very complicated map with tons of levels and grates and traps etc...but in the end, the only thing thatll matter is who got to the checkered circle on the far end first?