Operation: Tri-umph (alternatively known as Operation: Doom) was an EPF operation that started on February 10, 2016, and ended on March 2, 2016. During this event, Herbert P. Bear attempted to blast the island rooms, shrink EPF Agents and uncolorize the island, using the UFO's stolen power source. During the last week of the event, players could enter the Cave Maze for the second time in an attempt to stop Herbert's plans, and retrieve the power source.
The operation name is a pun on the word triumph and a portmanteau of the prefix tri meaning three, and umph which is an onomatopoeia of the beats of a speaker. This is because Herbert's machine is designed to have three speakers.