Deltarune Chapter 3 may be just around the corner, and one character's existing relationships would make them the perfect choice for a final boss. While The Penguin is great television ...
That being said, you can complete the Black Ops 3 easter egg solo as well ... Once done, fend off the zombies for about 30 seconds and open up the temple entrance. From there, head inside the ...
Do note that other known activities like building the Pack-a-Punch machine in the map, upgrading your weapons, and finding key items are all part of the easter egg steps in Black Ops 3 Zombies.