Similar to endless waves, but the player will face only cow monsters, which are unique to this mode. The cows vary in size, with a Bull Boss arriving at wave 50. The cows do not have specials, they move slowly, and do not have range. All they have is raw power, and LOTS of it. At higher levels it is not uncommon to see one cow kill a fully upgraded tier 4 unit within 2 hits. They do not have a special, but they are brutal.
they can easily kill a tier five dwarf at levels 19-20.