Boss Rush

BR Lv30
Round 30 - Mech Chick Round 40 - Mech Chick

BR Lv50
Round 30 - Zombie Sumo Round 35 - Zombie Hoard Round 40 - Zombie Sumo + Zombie Hoard Round 50 - Zombie Sumo + Zombie Hoard

BR Lv70
Round 10 - Foreman x2