Black Ops 6 Zombies features some of the most demanding Dark Ops challenges in the series, designed for players who thrive under high-pressure, high-skill conditions. These hidden objectives not only test your combat abilities but also your endurance, strategy, and mastery of the mode’s mechanics. Completing them rewards you with rare Calling Cards that showcase your achievements to other players.
Here are the hardest Dark Ops challenges in Zombies, why they’re so difficult, and strategies to help you beat them.
See also: Best Field Upgrade Augments Black Ops 6 Zombies – Full Guide
1. Involuntary Harm – Uber Klaus Core Chain Reaction
This Season 5 challenge requires you to spawn two Uber Klaus Elite enemies on the Reckoning map. You’ll need to weaken one until it’s one-shot while removing the mech suit from the other to expose the Uber Klaus Core. The tricky part is getting the Core to explode near the second Uber Klaus, destroying its mech suit.
Why it’s hard: Requires high rounds for dual spawns, careful health management, and risky positioning around explosive enemies.
Tip: Use crowd-control weapons and perks to keep surrounding zombies at bay while positioning the Uber Klaus pair. Since dual spawns usually occur at higher rounds on Reckoning, be ready for heavy elite density and refresh armor between phases to avoid splash damage from the Core’s detonation.
2. Apex Prey – Melee Finish on the Z.Rex
Found in Shattered Veil, this challenge demands that you ride the Z.Rex and finish it with a melee attack.
Why it’s hard: The Z.Rex becomes more aggressive each phase, and boarding it requires precise timing after a tail slam attack.
Tip: Bring a durable melee weapon and strong defensive perks, and save your finisher for when the Z.Rex’s health is critically low. Only jump onto its back during the tail slam animation, as mistiming the leap can cause heavy damage or even instant downs.
See also: All Free Power-Up Locations on Reckoning – Black Ops 6 Zombies Guide
3. Grief Goat – 115 Grief Wins
Grief mode pits two teams of four against each other to see who survives longest. You’ll need to win 115 matches.
Why it’s hard: Matches can last a long time, and you’re dependent on both your skill and your team’s performance.
Tip: Coordinate with a consistent group of players to improve your win rate and reduce match times, and consider using disruption-focused builds—such as crowd-control scorestreaks—to force the opposing team into high-risk positions.
4. Of Legend – Sword-Only Guardian Kill
To earn this Calling Card, defeat the Citadelle des Morts’ Guardian boss using only a sword—no other weapons, equipment, or stray shots allowed.
Why it’s hard: The Guardian is a challenging endgame boss, and melee combat leaves little room for error.
Tip: Use the Solais Lion Sword with the Melee Macchiato’s Vampiric Extraction Augment for sustained health and armor regeneration, and avoid any non-sword hits—even accidental splash damage—as they will void the challenge.
5. Dark Journey – Nebula Camo on 33 Weapons
This grind-heavy challenge requires earning Nebula camo on 33 weapons, progressing through multiple camo tiers.
Why it’s hard: Roughly 2,700 kills per gun means around 90,000 total zombie kills.
Tip: Focus on one weapon at a time in high-round matches to maximize kill counts, and remember that Nebula requires Mystic Gold → Opal → Afterlife progression before unlocking. Plan your camo grinds around weapons that can handle both headshot and elite kill requirements efficiently.
See also: Reckoning Aetherella Easter Egg Guide – Black Ops 6 Zombies
6. Fatale – Double Amalgam Kill
You must kill two Amalgams—tough elite enemies—with a single shot.
Why it’s hard: They spawn after round 20+, move fast, and can heal by consuming other zombies, making it difficult to line them up at low health simultaneously.
Tip: Use a Pack-a-Punched Cigma rocket launcher or high-damage sniper to deliver the final blow, and control spawns by leaving one Amalgam partially damaged while luring the second close, then syncing their health levels before taking the shot.
7. Quest Complete (Early) – Pre-Directed Mode Easter Egg Clear
Finish a main Easter egg on any map before Directed Mode becomes available.
Why it’s hard: Early runs lack optimized community strategies, making the process more trial-and-error.
Tip: Watch early Easter egg hunt streams or work with a coordinated squad to figure out puzzle steps faster, and be prepared for unbalanced enemy spawns or unpatched bugs by carrying redundant ammo and scorestreak options.
See also: How to Get All Gorgofex Upgrades in Black Ops 6 Zombies – Complete Guide
8. Social Distancing – Flawless to Round 20
Reach Round 20 without taking any damage.
Why it’s hard: One stray hit from any zombie, parasite, or ranged enemy ends the run.
Tip: Liberty Falls offers open spaces to maintain distance, so rely on Scorestreaks and powerful weapons to eliminate threats before they get close, and prioritize taking out Parasites and Manglers immediately, as their acid spit and blasts are common run-enders.
9. Good Enough – Bare-Bones Round 20
Survive to Round 20 with only your starting loadout, no Augments, no Perks, no Ammo Mods, and no Field Upgrades.
Why it’s hard: Limits your survivability and firepower as the rounds progress.
Tip: Pick a strong starting weapon like the GS35 and build the Jet Gun for crowd control while keeping distance from hordes, and take advantage of allowed armor purchases and buildables to offset the lack of perks and mods.
10. Kunoichi – Multi-Tier Melee in 8 Seconds
During a single use of Aether Shroud with Void Sheath Augments, kill 3 zombies, 2 specials, and 1 elite.
Why it’s hard: Requires perfect setup and execution within a short time window.
Tip: Attempt this on Terminus against an Amalgam for easier melee kills, ensure your melee weapon is fully Pack-a-Punched for maximum damage, and use Void Sheath to extend Aether Shroud’s duration so you can cluster enemies beforehand and complete the kill chain without chasing targets.
See also: The Tomb Easter Egg Guide – Complete Walkthrough for Black Ops 6 Zombies
11. Another Round? – Endurance to Round 100
This is the ultimate survival grind—AI health scaling, constant elite spawns, and resource drain make it a battle of stamina as much as skill.
Tip: Switch from camping to training routes mid-game to manage zombie flow, and maintain a salvage reserve for armor and scorestreak refreshes.
12. Invincible – Round 30 Without a Down
One down ends the attempt, so consistency is king.
Tip: Refresh armor every few rounds, keep escape routes clear, and save high-impact streaks like the Chopper Gunner for emergencies.
13. Light ’Em Up – Napalm Burst Elite Farming
Requires 10 ignited elite kills in one match, forcing specific mod usage and spawn pacing.
Tip: Use Napalm Burst with Big Game Augment to extend burn duration and trigger kills; weaken elites first to guarantee the fire damage lands the final blow.
14. Terminal – Post-Round-50 Easter Egg Completion
The step execution happens under late-round density, so crowd control is as important as boss damage.
Tip: Clear the map before triggering EE steps and bank streaks to deploy during high-pressure phases.
See also: How to Unlock Olympia in Black Ops 6 and Warzone – Camos, Attachments, and Event Guide
15. Liberated – Liberty Falls EE Under 30 Minutes
Forces a speedrun mentality where one mistake can cost the run.
Tip: Assign roles in your squad before starting, skip non-essential purchases, and use direct routes to EE triggers.
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The hardest Dark Ops challenges in Black Ops 6 Zombies aren’t just about combat skill—they demand patience, endurance, precise execution, and sometimes a bit of luck. Including ultra-endurance goals like “Another Round?” or time/round-gated Easter eggs such as “Terminal” and “Liberated” ensures you’ll be tested in every aspect of Zombies gameplay—from survival instincts to route optimization.
Whether you’re grinding Nebula camo on dozens of weapons or attempting flawless survival runs, these objectives are designed to separate the most dedicated zombie slayers from the rest. Completing them all not only rewards you with rare Calling Cards but also solidifies your status as a true master of Zombies mode.
