How to Play Halo: Campaign Evolved by LASO and Complete All Skulls

Halo: Campaign Evolved introduces a brand-new way to replay the campaign through the Skull system and the legendary LASO challenge. Whether you're revisiting Halo for the first time in years or jumping into Campaign Evolved as a newcomer, understanding how Skulls work is the key to unlocking the game's toughest content.

Instead of simply increasing the difficulty, Skulls change the way every mission plays. Some make enemies stronger, others limit your resources, and a few completely change the rules of combat. Once you've collected enough Skulls, you'll be able to take on Legendary All Skulls On (LASO)—the ultimate campaign challenge.

This guide explains how to unlock LASO, how the Skull system works, and what every beginner should know before starting a full LASO run.

 

What Is LASO in Halo: Campaign Evolved?

LASO stands for Legendary All Skulls On. As the name suggests, you'll play the campaign on Legendary difficulty with the official set of gameplay-modifying Skulls enabled at the same time.

Unlike a normal Legendary playthrough, LASO combines multiple Skull effects together, making enemies deadlier, reducing available ammo, changing shield recovery, and introducing several other gameplay restrictions. Even experienced Halo players consider LASO one of the hardest ways to complete a campaign.

Mode	Difficulty	Skulls
Standard Campaign	Any	Optional
Campaign Remix	Any	Custom or Random
LASO	Legendary	Official LASO Skull Set

If you're completely new to Halo, it's recommended to finish the campaign once before attempting LASO.

 

How to Unlock LASO

Unlocking LASO isn't difficult, but it does require spending some time exploring the campaign and collecting Skulls.

Step 1. Play Through the Campaign

Your first goal should simply be completing missions while learning enemy behavior, weapon locations, and level layouts. Familiarity with each mission becomes extremely important once you reach Legendary difficulty.

Step 2. Find Hidden Skulls

Throughout the campaign you'll discover hidden Skulls placed in secret locations.

Every Skull permanently unlocks a gameplay modifier. Once collected, it can be activated before starting future missions or Campaign Remix sessions.

Some Skulls are easy to spot, while others require exploration or clever platforming to reach. Checking corners, rooftops, caves, and optional paths will often reward curious players.

Step 3. Unlock More Remix Options

As your Skull collection grows, you'll unlock additional customization options for Campaign Remix.

Remix mode allows players to create unique campaign experiences by mixing different Skull modifiers together. Instead of following the standard Halo rules, you can dramatically change how encounters play, making missions either much easier—or significantly harder.

This is also one of the best ways to experiment with Skull combinations before jumping into a full LASO run.

Step 4. Start Your LASO Challenge

Once you're comfortable with the mechanics, simply:

• Open Campaign.
• Select a mission or start a new campaign.
• Choose Legendary difficulty.
• Enable the official LASO preset.
• Begin your challenge.

Skull hunting is also tied to several achievements and trophies, including the ultimate MYTHIC challenge. Check out our Halo: Campaign Evolved Achievement and Trophy Guide to see the full list and plan your completion run.

For players interested in mastering Halo's campaign, collecting all 42 Skulls is well worth the effort.

 

How Many Skulls Are There?

Halo: Campaign Evolved features a total of 42 collectible Skulls, including both returning fan favorites and completely new modifiers.

Skull Category	Number
Returning (Legacy) Skulls	26
New Skulls	16
Total	42

Most of these Skulls are hidden throughout campaign missions, encouraging players to thoroughly explore every level instead of rushing toward objectives.

Even if you don't plan to complete LASO immediately, collecting Skulls gives you access to more gameplay options and makes future playthroughs much more enjoyable.

 

The Most Important Skulls to Know

Not every Skull has the same impact. Some only provide small gameplay changes, while others completely redefine combat. These are among the most important modifiers you'll encounter.

Black Eye

Your shields only recharge after successfully landing melee attacks on enemies.

This Skull forces aggressive gameplay and can be especially dangerous when facing large enemy groups or ranged opponents.

Iron

Deaths become much more punishing.

In solo play, dying often means restarting significant portions of the mission, making every mistake much more costly than usual.

Mythic

Enemy health increases dramatically.

Battles become longer, stronger weapons become even more valuable, and efficient ammo management becomes essential.

Thunderstorm

Higher-ranked Covenant enemies appear more frequently.

You'll encounter tougher Elites and more dangerous enemy squads much earlier than in a normal campaign.

Famine

Enemies drop significantly less ammunition.

Running out of ammo is one of the biggest challenges during LASO, making weapon selection and conservation incredibly important.

Boom

Explosions become much larger and far more lethal.

Grenades, fuel rods, and explosive weapons can eliminate enemies quickly—but they're just as dangerous to you.

 

Beginner Tips Before Starting LASO

LASO can feel overwhelming at first, but a few good habits will dramatically improve your chances of success.

Take Your Time

Charging directly into combat rarely works on Legendary.

Use cover, eliminate priority targets first, and only advance once the battlefield is under control.

Learn Weapon Locations

Because Skulls like Famine reduce available ammunition, knowing where powerful weapons spawn can save an entire mission.

Always plan ahead instead of relying on random weapon drops.

Don't Ignore Melee Combat

Black Eye changes shield recovery completely.

Whenever it's safe, finish weakened enemies with melee attacks to restore your shields before engaging the next group.

Play Co-op If Possible

Campaign Evolved supports online cooperative play, making difficult encounters much more manageable.

Teammates can revive momentum during difficult fights, cover different angles, and divide enemy attention, which is especially valuable during LASO.

Experiment in Campaign Remix First

Before attempting a full LASO run, spend some time testing different Skull combinations in Campaign Remix.

Understanding how individual modifiers affect gameplay will make the complete LASO experience far less intimidating.

 

Do You Need Every Skull?

Not necessarily.

If you simply want to enjoy Halo: Campaign Evolved's story, collecting every Skull isn't required.

However, completing your collection is highly recommended if you want to:

• Experience every Campaign Remix modifier.
• Create custom challenge runs.
• Prepare for LASO.
• Complete all campaign-related achievements and collectibles.

For players interested in mastering Halo's campaign, collecting all 42 Skulls is well worth the effort.

 

FAQ

Can I collect Skulls while playing Co-op?

Yes. Campaign Evolved supports Skull collection during cooperative play, making it easier to explore missions together.

Can I turn Skulls on and off whenever I want?

Yes. Once a Skull has been collected, it remains permanently unlocked and can be enabled or disabled before starting compatible campaign sessions.

Is LASO required to finish the campaign?

No. LASO is an optional endgame challenge designed for players looking for Halo's highest level of difficulty.

Should beginners try LASO immediately?

Probably not. Completing the campaign normally—or even on Heroic difficulty—first will help you learn mission layouts, enemy encounters, and weapon placements before tackling Halo's toughest challenge.

 

Conclusion

Collecting all 42 Skulls and completing a full LASO run will take patience, careful planning, and a strong understanding of every mission. Start by exploring the campaign, learning weapon locations, and testing different Skull combinations in Campaign Remix before taking on Legendary All Skulls On.

Ready to put these strategies into action? Get your Halo: Campaign Evolved Xbox/PC key at LDShop at a competitive price and begin your LASO challenge.