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PhD Slider

PhD Slider sets off an explosion when the player slides into enemies, the successor of PhD Flopper in Black Ops 4 and Black Ops Cold War.

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aggiornato 2026-11-11

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PhD Slider, in full PhD Slider Soda, is a Perk-a-Cola of Call of Duty Zombies that turns a slide into an explosion. It is the successor of PhD Flopper, the diving perk of Black Ops and Black Ops II, and exists in Black Ops 4 and Black Ops Cold War.

Overview

First appearanceLaunch maps of Black Ops 4, October 12, 2018

GamesBlack Ops 4, Black Ops Cold War (Season Six)

Cost4,000 to 4,500 points (Black Ops 4)2,500 to 7,000 (Cold War)

EffectSliding into an enemy triggers an explosion

FamilyPerk-a-Cola

MachineOnly in Cold War, on Forsaken: a new take on the PhD Flopper machine

JingleFunk and disco, the PhD Flopper jingle reused as it is

In the First Room

No map book of the Hub names PhD Slider in a First Room. Its only machine is on Forsaken, where the book gives Death Perception as the only Perk-a-Cola of the starting room, and no Cold War book describes a Der Wunderfizz that works doors closed. In Black Ops 4, one book gives a perk altar in the First Room:

Map	Game	What the book says
Voyage of Despair	Black Ops 4	Through the Danu altar, by the railing to the right of the spawn, the only perk of the First Room: it serves the perk the player placed there in the loadout, at the price of that perk, so PhD Slider only when it was placed on that altar. The book does not name PhD Slider.

The rounds reached with the doors closed on each of these maps are on the ZFRR leaderboards.

Effect, game by game

	Game	Cost	What it does
	Black Ops 4	4,000 to 4,500	Sliding builds up a charge; once it is full, the icon pulses and sliding into an enemy triggers an explosion. The perk is bought fully charged. It also gives full resistance to self-inflicted explosive damage and partial resistance to enemy explosives.
	Black Ops Cold War	2,500 to 7,000	Added with Season Six on October 7, 2021. No charge any more: sliding into a zombie sets off a burst of Aetherium, larger and stronger the farther the slide went before impact. Immunity to the player’s own explosives now waits for Tier III.

In Black Ops 4, patch 1.11 of January 15, 2019 changed the resistances: self-inflicted explosive damage dropped to zero, and the reduction of enemy explosive damage went from 80% to 50%. Set as the Modifier perk, with every other perk owned, PhD Slider also slides farther, ignores trap damage during the slide and hits harder when the slide starts from a height.

Upgrades

Black Ops 4 has no tiers, only the Modifier bonus above. In Black Ops Cold War, five tiers bought with Aetherium Crystals:

Tier	Effect
I	Immunity to environmental damage while sliding.
II	Increased slide duration.
III	Immunity to self-inflicted explosive damage.
IV	Increased slide speed.
V	Falling from a large height triggers an explosion, larger and stronger the higher the fall.

Where to find it

Black Ops 4

No machine of its own. It is the last perk unlocked in Create-A-Class, at level 42, and follows the loadout onto all eight maps: Voyage of Despair, IX, Blood of the Dead, Classified, Dead of the Night, Ancient Evil, Alpha Omega, Tag der Toten.

Black Ops Cold War

Its only machine is on Forsaken. On Die Maschine, Firebase Z, Mauer der Toten and in Outbreak, it is sold by Der Wunderfizz. It is also a Legendary reward of the Trials.

PhD Flopper

The predecessor, whose explosion comes from a dive to prone. It is the one that returns in Black Ops 6 and Black Ops 7.

Death Perception

The other loadout perk of Black Ops 4 added late to Cold War, one season earlier.

Trivia

The jingle

It is the original PhD Flopper song, so it still sings the name of the older perk and its dive to prone.

The logo

Cold War was first going to keep the Black Ops 4 logo; an unused ping icon with that logo remains in the files. The final one resembles the PhD Flopper logo.

The can

Its label lists castor oil, nitroglycerin, powdered graphite, blasting cap extract and distilled banana peel.

Silence

In Black Ops Cold War, no operator has a callout for PhD Slider.