Leviathan: Secrets

The five masks

Each mask of Leviathan is won by a task. A sound plays when it is done, and the mask waits in the mask room, reached through a portal between the Submarine Launch Facility and the upper crafting room, once per round. Every mask lets the player breathe under water without the ABA.

God mask

Every player completes all three of their personal challenges. The mask room lists its effects: one more hit from all enemies, a longer sprint, 50% more damage and 33% less damage from all enemies. Guides advise it for the final boss.

Shark mask

Shoot the six sharks that swim outside the base: at the spawn, near Stamin-Up, past the barrier from Stamin-Up towards the Biodome, outside the Cafeteria where Deadshot stands, near Speed Cola, and outside the backup power room. It makes the player faster under water and lets the player use the Hacker there.

Golden ABA

Flood every area that can be flooded. The Steam guide lists the three areas of the excavators, the Cafeteria, the Power Room and the Laboratory; Sassy Asi adds the room of the submarine, whose windows break with a grenade. One more hit from the zombies and a longer sprint.

Leaper mask

Kill enough Leapers with melee; Ernie935 counts 30. Half the damage from the Leapers and a third more damage against them.

Diver mask

Kill three Divers with the Harpoon Gun. The code 3483 calls a Diver. One more hit, half the damage from the Divers, a third more damage against them.

Personal challenges

Each player has a screen with three challenges on the seabed of the spawn: staying in an area for some rounds, kills with a given weapon, Leapers killed with melee, and more. The first gives a Max Ammo, the second a random Pack-a-Punched weapon, from a pistol to the Wave Gun, and the third a free perk. A Hacker swaps a challenge for 1500 points.

Keypad codes

The keypad in the Pack-a-Punch submarine takes four-digit codes. Only one code works at a time. The codes below are those of the MZC guide and the Steam guide of the map.

Code	Effect
0115	Plays the song 115
0439	Starts the excavator of the Biodome
0743	Starts the excavator of the Submarine Launch Facility
2265	Gives 1000 points
2473	Starts the excavator of Tunnel 11
2666 and 7836	Drop a live grenade
3279	Slows the zombies down for a while
3473	Fire Sale
3483	Calls a Diver mini-boss
3855	Max Ammo
4376	Refills the specialist weapon
6853	Nuke
9277	Teleports the players to a random spot
9355	Free QEDs, once the Vrill Device is in hand
7225	Bonfire Sale, listed by the Steam guide only

Free Gersh Devices

In the backup power room, a Hacker turns the wall of screens into a soul box for 1000 points. Filled with souls, it shows a four-digit code; typed on the keypad, it leaves free Gersh Devices in the submarine.

The wall of screens

Hacked for 1000 points, it becomes the soul box.

The song: Lost It All

Three teddy bears around the base start the song of the map, Lost It All by Avenged Sevenfold: one above the door on the seabed of the spawn, one up the small steps of the Submarine Launch Facility, and one on the floor of the rocket silo room.

Other secrets

Free perks of the Leapers

A Leaper round finished without a single missed shot gives a free perk. Guides kill them with melee, with the Bowie Knife or the shield.

Shark power-ups

Any shark shot down above an underwater area drops a random power-up, and another one comes back soon after.

Radios

A fan map and the title of a video say that finding all the radios of the base gives a Max Ammo; none of the guides read for this book shows it.

Excavators on demand

The three excavator codes flood their areas at once, which the Golden ABA and the uranium need.