Bully Den is the twenty-eigth level in Challenge mode in Pikmin 2. When the countdown timer falls to 270, two Waterwraiths fall and begin rolling around the cavern. The Waterwraiths can easily be subdued by petrifying them and assaulting their backsides once they break free. An alternate strategy employs hiding in one of the tunnels found in the Den and launching an attack from the limited safety they provide. It is recommended that gates should not be destroyed, as they help seperate the Waterwraiths.
Other creatures make an appearance in the Den as well. At the start, there are two Volatile Dweevils and one Anode Dweevil. More creatures will fall from the ceiling as the timer counts down, those creaturs being a Wollywog, a Yellow Wollywog, and an Anode Beetle.
The stage begins with twenty-five purple Pikmin, but the absence of Candypop Buds means they cannot be converted into other types. One Waterwraith drops the key when defeated; the other drops the Silencer.