Persistent Upgrades

Persistent Upgrades, also known as "Perma-Perks", are unlockable upgrades that the player(s) can gain through unique methods. These upgrades only take effect and can be acquired on TranZit, Die Rise, and Buried.

When an upgrade is obtained, a green haze (similar to picking up a Power-Up) appears near the player, and a character says a line about it. Losing one will result in a faint eerie sound.

Faster Revive
The player can earn faster revives (revives are twice as fast) by reviving downed allies 17 times in one game. The effect can be stacked with Quick Revive, making revives nearly instantaneous.

To lose it, the player must try and fail to revive a downed person, even if said person is later revived. Even an accidental fail (such as being knocked out of the way) will cause the upgrade to be lost.

More Headshot Damage
The player can earn increased headshot damage by getting an arbitrary amount of collateral headshots (multiple headshot kills with one bullet). In addition to increased headshot damage, shooting a zombie anywhere will make its head pop, although this effect is aesthetic. Sometimes the green flash will show in Survival on any of the survival maps, though the persistent upgrade will not be applied.

To lose it, the player must kill twenty five to seventy five zombies in a row without a headshot.

Stronger Barriers
The player can earn stronger barriers to be built on windows by repairing two hundred & fifty barriers in one game. The barriers are partially made of steel and screwed in, so it will take more time for them to be taken down.

To lose it, the player must fail to build a single barrier in a round.

Stronger Carpenter Barriers
The player can earn reinforced barriers for Carpenter to build by killing a zombie trying to come out of a barricade meanwhile the Carpenter is boarding the windows. The effect is separate from the stronger barricades above, and can be earned and lost without either affecting another. However, the barricades are the same.

To lose it, the player must fail to kill a zombie trying come out of a barricade during a Carpenter, regardless of if there are any.

200% Health
The player can earn 200% Health, with a down resulting after four hits instead of two. The effect stacks with Juggernog, allowing the player to have a maximum of 300% health. This upgrade is obtained when the player is downed without Quick Revive, and thereby end the game, about three times.

To lose it, the player must die on or after round fifteen while teammates are still alive.

Red Insta-Kill
The player can earn a subversion of Insta-Kill by not killing a single zombie during an Insta-Kill, twice in a row. The effect lasts fifteen seconds, is activated when an Insta-Kill is obtained and allows the player to simply walk into a zombie to kill it. Killing a zombie using it will only give fifty points.

To lose it, the player must be damaged by a zombie during the Insta-Kill (with the exception of a flaming zombie exploding).

Refund on Perks
The player can earn an upgrade to give one thousand points every time when going prone in front of a Perk-a-Cola machine after buying said perk. This upgrade is obtained by going prone in front of the machine around 60 times after buying it.

To lose it, the player must not go prone in front of a Perk-a-Cola machine after buying it.

Mystery Box Upgrade
The player can earn an upgrade to decrease the chances of getting "bad" weapons from the Mystery Box. This upgrade is obtained when the player takes a random amount of weapons from the Mystery Box. The player will see a glow and a teddy bear will appear on the box.

This upgrade is automatically lost at the start of round ten.

PhD Flopper
The player can earn an upgrade to not take any splash damage or fall damage (only if they dolphin dive off of the edge) & to create an explosion when dolphin diving from an edge. This upgrade is obtained when the player takes a certain amount of fall damage five to ten times.

This upgrade is only available on Buried.

To lose it, the player must take significant fall damage by falling with out dolphin diving.

Half-off
The player can earn an upgrade to reduce all purchase costs by half during a Double Points Power-Up. If the player does not have enough money to purchase the item even with Half-off, it may take an even smaller amount. This upgrade is obtained when the player accumulates three thousand or more points during a Double Points Power-Up.

This upgrade is lost when the player fails to spend at least 1000 points during the next Double Points.

Double Points
The player can earn an upgrade to give twice the points you would normally earn (twenty points for a non-lethal hit, one hundred & twenty for a lethal torso shot, etc). This upgrade is obtained by only getting a random amount of headshots or melee kills only during a Double Points Power-Up.

To lose it, the player must kill a zombie with melee or a headshot at any time.

Tombstone
The player can earn an upgrade to retain all of their perks except Quick Revive after being downed and revived by another teammate (or Quick Revive itself). This upgrade is obtained when the player buys four perks before round four.

In a game with two or more players, the player will retain all of their perks except for their last obtained perk. Quick Revive will always be lost first, however.

It is currently unknown how to lose this effect.

Extra Sniping Points
The player can earn an upgrade to give an extra three hundred points with each kill made using a sniper rifle. This upgrade is obtained when the player gets five to fifteen long range kills using any sniper rifle.

To lose it, the player must miss too many shots with a sniper rifle.

Double Pistol Points
The player can earn an upgrade to give double points from shots fired from a pistol. This upgrade is obtained when the player fires all rounds from a pistol without hitting a single zombie, then kills a few zombies with melee.

It is unknown how this upgrade is lost.

Ray Gun Off The Wall
The player can earn an upgrade to buy the Ray Gun off the wall for five hundred points (in place of the Olympia). This upgrade is obtained when the player buys the Olympia or ammo for it a few times.

The player can only obtain this upgrade if they are rank two or lower & they only have two or less tally marks.

This upgrade is automatically lost between round twelve & fourteen.