How to Activate Skulls in Halo Campaign Evolved

To activate Skulls in Halo: Campaign Evolved, go to the main menu, select Campaign, then choose New Game instead of Continue (which just resumes your existing save without touching Skulls). Pick a difficulty, select an unlocked mission and rally point, then enable your collected Skulls on the Select Skulls screen and hit Apply & Start.

How to Activate Skulls in Campaign Evolved

Skulls only activate through a fresh campaign session, not through Continue or the pause menu.

Follow this menu path to turn them on.

Open the main menu and select Campaign.
Choose New Game instead of Continue.
Pick a difficulty level.
Select any mission and rally point (checkpoint) you have already unlocked.
On the Select Skulls screen, toggle every Skull you want active.
Select Apply & Start to load the mission with those modifiers running.

Starting a New Game overrides your current solo campaign save, but it does not delete your unlocked missions or rally points. You can still jump back into any section you have already reached, just with a fresh session and your chosen Skulls applied.

How to Turn Off or Change Active Skulls

You cannot toggle Skulls once a mission is already running.

There is no in-mission or pause menu option to disable them mid-play. To remove or swap out active Skulls, return to the main menu, select Campaign, then New Game again. Pick your difficulty, mission, and rally point as before, then deselect the Skulls you no longer want on the Select Skulls screen before pressing Apply & Start. This same process applies whether you want to turn off one Skull or replace your entire combination.

How Many Skulls Are There in Halo Campaign Evolved?

Once you know how to turn Skulls on and off, the next question is how many you’re actually chasing. The full Skull count in Campaign Evolved sits at 42.

Most of that total comes from the campaign itself: 39 Skulls sit hidden across the 13 missions, broken down evenly at three per level. The other three don’t come from exploration at all. They open up through Campaign Remix once you’ve tracked down three standard Skulls anywhere in the game. As for what’s actually on the list, it’s a blend of names longtime players will recognize (Bandana, Iron, Mythic, Grunt Birthday Party, Acrophobia) sitting alongside 16 new modifiers built specifically for this version of the campaign, several of which are covered below.

New Skulls Added in Campaign Evolved

Several Skulls in this release did not appear in the original Combat Evolved.

Perspective switches the camera to a third-person view for the entire mission. Give & Take drains your shields whenever you fire a weapon, but dealing damage restores them. Endurance Spec makes UNSC vehicles impossible to destroy, which turns vehicle-heavy sections much safer. Efficient, Foreign, and They Come Back round out the new additions, each altering combat encounters or resource management in its own way.

What Do Campaign Remix Skulls Do?

Collecting three standard Skulls unlocks Campaign Remix and its three exclusive modifiers.

Adaptation randomizes which enemy types appear in a mission. Reload randomizes weapon placements and spawns. Armistice makes normally hostile enemy factions fight alongside each other instead of against the player. These three work differently from the standard Skulls since they change encounter variety rather than simply raising or lowering difficulty.

Best Skull Combinations to Try

Turning on every Skull you own at the same time usually backfires, since it gets hard to tell which one is actually causing what you’re seeing on screen. Pairing two or three related Skulls gives a clearer, more controlled result.

If your goal is a smoother run through a mission you’ve already beaten, pair Bandana with Stowed Reload. The unlimited ammo and grenades from Bandana cover your firepower, and Stowed Reload handles the rest by refilling holstered weapons on its own. Want to see an old mission from a fresh angle instead? Perspective’s third-person camera combined with the flight Acrophobia unlocks through double jumping changes how familiar rooms and firefights feel.

On the harder end, stack Mythic, Thunderstorm, and Angry together: Mythic adds extra enemy health, Thunderstorm bumps their rank up, and Angry gets them firing faster, all in the same fight. Campaign Remix has its own combo too: running Adaptation, Reload, and Armistice together swaps out enemy types, weapon spawns, and faction alliances at once, which keeps even a well known mission from playing out the same way twice.

A handful of Skulls are strong enough to test alone first. Floor Is Lava punishes you just for standing still, Give & Take costs you shields with every shot you fire, and Iron sends you back to the start of the level the moment you die in solo play. Any one of these can reshape an entire mission without needing another modifier stacked on top.

Do Skulls Disable Achievements or Trophies?

No, running Skulls won’t cost you achievements or trophies.

Feel free to load up whatever combination of modifiers sounds fun. Progression rewards keep unlocking the same way they would on a clean playthrough. The one catch involves collectible-specific achievements, which don’t care what Skulls you’ve turned on. Those only unlock once you’ve actually located every hidden Skull and every Terminal yourself.

All Halo Campaign Evolved Skull List by Mission

Here’s every standard Skull broken down by the mission it appears in, so you can check what you’re still missing on a specific level.

The Pillar of Autumn

Skull	Effect
Speed Limit	Sprinting is turned off.
Magnified	The Assault Rifle holds 60 rounds per magazine instead of the default.
Perspective	Switches the camera to third-person for the whole mission.

Halo

Skull	Effect
Give & Take	Firing weapons costs shields, but landing hits on enemies restores them.
Grunt Funeral	Grunts explode in plasma when killed.
Floor is Lava	Standing on the ground deals damage over time.

The Truth and Reconciliation

Skull	Effect
Iron	Death resets to the last checkpoint in co-op, or restarts the level in solo.
Endurance Spec	UNSC vehicles become indestructible.
Foreign	Enemy faction weapons can no longer be picked up or used.

The Silent Cartographer

Skull	Effect
Bandana	Ammo and grenades never run out.
Acrophobia	Double jumping lets you fly.
Hip Fire	Weapon zoom and aim-down-sights are disabled.

Assault on the Control Room

Skull	Effect
IWHBYD	Unlocks hidden dialogue lines.
Angry	Enemies fire faster and more often.
Cowbell	Objects lose mass and become easier to knock around.

343 Guilty Spark

Skull	Effect
Fog	Turns off the motion tracker.
That’s Just… Wrong	Enemies notice you faster and react more aggressively.
They Come Back	Flood enemies grow stronger each time they reanimate.

The Library

Skull	Effect
Tilt	Boosts both the damage you deal and the damage you take.
Pop	Shooting a Flood enemy’s weak point makes it explode.
Famine	Enemies drop half the usual ammo.

Two Betrayals

Skull	Effect
Tough Luck	Enemies go berserk, dodge incoming fire, and stop retreating.
Black Eye	Shields only regenerate from melee kills.
Mythic	Enemy health is increased.

Keyes

Skull	Effect
Catch	Enemies throw and drop grenades more frequently.
Blind	Removes the HUD and hides your weapon model.
Pinata	Melee hits make enemies drop grenades.

The Maw

Skull	Effect
Stowed Reload	Holstered weapons reload on their own.
Boom	Doubles explosion radius.
Thunderstorm	Raises the rank of most enemies.

Boarding Action

Skull	Effect
Malfunction	A random HUD element disappears each time you respawn.
Johnny Ammo Seed	Reloading with a half-full magazine wastes the remaining ammo.
Leadhead	Headshots no longer deal bonus damage.

The Most Dangerous Game

Skull	Effect
Temperamental	Allies turn hostile if you kill a friendly soldier.
Recession	Every shot fired uses 2 bullets instead of 1.
Ghost	Enemies stop flinching when hit.

Heavy Burden

Skull	Effect
Eye Patch	Turns off auto-aim.
Grunt Birthday Party	Headshots on Grunts trigger a celebratory explosion.
Efficient	Killing enemies while at full health yields extra ammo.

Campaign Remix (unlocked after collecting 3 Skulls)

Skull	Effect
Adaptation	Randomizes which enemy types appear.
Reload	Randomizes weapon placements and spawns.
Armistice	Makes rival enemy factions fight alongside each other.

How to Activate Skulls in Halo Campaign Evolved: All 42 Skulls