The Jungle in Chaos
From SmashWiki, the Super Smash Bros. wiki
The Jungle in Chaos is a single-player event match in Super Smash Bros. for Wii U. The player controls Diddy Kong, and must defeat 20 Donkey Kongs in a multi-man battle, some of which have custom moves. The Donkey Kongs all wear Bunny Hoods and have launch resistance.
This event is unlocked by clearing Guardian of the Jungle. Completing the event does not unlock any additional paths. Once both the event is completed and Falco is unlocked, the down path is unlocked.
Completing the event on normal or hard difficulty within 90 seconds awards a Shield Healer Rocketbarrel Pack equipment.