Kernel Hearts Walkthrough: Beginner's Guide to Surviving Babel, Leveling Up, and Dethroning God

Why You Need a Kernel Hearts Walkthrough Before Launch

If you're diving into the upcoming action RPG from Ephemera Games, you've probably noticed that Kernel Hearts doesn't hold your hand. This is a multiplayer co-op roguelike that asks you to accept death, learn from it, and climb the Tower of Babel anyway. Having a solid Kernel Hearts walkthrough in your back pocket isn't about cheating your way through — it's about respecting the run-based structure and making every death count.

The game places you in the M.A.H.O.U. Unit, a squad of magical girls tasked with eliminating angels and dethroning God to save a world drowning in ashes. The demo, set in the Folktale Fields, gives players a taste of the loop: explore, fight, die, upgrade, and come back stronger. The full game launches September 17 on Steam, and a final demo update just landed with major balance changes, Japanese voice acting, and improved performance.

This Kernel Hearts walkthrough covers everything beginners need to know before their first run — from the permanent tech tree and resource economy to hidden areas, catapult escapes, and the best ways to prepare for the seven-floor climb ahead.

What Is a Run in Kernel Hearts, Really?

Before we get into specific tips, it helps to understand the core structure. Like most roguelikes, Kernel Hearts resets certain elements every time you die. You lose your current run's build, your position on the map, and the temporary power-ups you collected along the way. What you keep, though, is what makes progress possible.

Here's the breakdown based on the demo experience:

The tech tree is your permanent progression system. Before heading back into battle, you can increase HP, defense, attack, and other stats. This means even a failed run isn't wasted — it's fuel for the next attempt. Community reports from the demo emphasize that players who invested in survivability early had a much easier time reaching the mysterious castle at the edge of the map.

The demo only offered 2 floors, while the full game has around 7. According to the developers, things get "considerably crazier" later in a full run, so building good habits now is essential.

How to Survive Folktale Fields: Core Combat Tips

The demo's opening area, Folktale Fields, is a sweeping field that lets you roam around picking fights with the various beasts of God. If you're following a Kernel Hearts walkthrough for the first time, here's what you need to know about combat fundamentals.

Choose Fernet for Your First Run

Fernet is the Spiritmancer vessel featured in the demo. She's offensively and defensively balanced, making her the best starting choice for new players. She dashes around with a one-handed sword, can dodge and block, and calls on familiars to assist in battle. This flexibility means you can handle swarms and single tough enemies without much trouble.

Players can unlock an additional vessel in the demo by putting in the work — and that unlock likely carries into the full game, giving you more options on day one.

Master the Golden Rule: Be Bold, Accept Death

The demo hands-on preview sums it up perfectly: be bold, accept death, hit things. In Kernel Hearts, being passive is how you get cornered. The angelic enemies are aggressive, and hanging back doesn't prevent damage — it just delays it. You need to learn enemy tells, dodge into open space, and keep the pressure on.

That said, blocking is just as important as dodging. Fernet's defensive kit means you can tank some hits if you mistime a dodge, which is far more forgiving than a pure glass-cannon playstyle.

Mementos and Relics: Pick Scaling Options

The latest demo update rebalanced most Mementos and Relics so they scale better with player level. The developers also adjusted enemy numbers throughout the game to make encounters feel less spongy while maintaining the challenge level. What does this mean for a Kernel Hearts walkthrough?

You should prioritize Mementos and Relics that grow with you rather than flat bonuses. Early in a demo run, a flat +10 damage might feel great, but a scaling option will outperform it by floor two or three. Community reports suggest that stacking the same scaling archetype (offensive, defensive, or summon-focused) creates far more consistent runs.

Exploration Secrets: Crevasses, Catapults, and the Hidden Castle

One of the biggest mistakes new players make is staying on the main path. Kernel Hearts rewards curiosity in a big way, and the Folktale Fields are filled with secrets that dramatically accelerate your progress.

Here's a quick exploration checklist from the demo:

• Drop into every crevasse you find. These often lead to optional battles, including stone angels that drop lots of souls.
• Don't fear falling. There are catapults everywhere, and they serve two purposes: escaping secret areas and traveling across the map.
• Look for glowing anomalies. One player's demo run only revealed a glowing pile of loops in a corner of the world on the third death — that was a castle hidden in a large hollow.
• Expect a protective barrier. The castle in the demo is banded by a barrier, and accessing it isn't immediately obvious. Plan multiple runs to solve it.

The hidden castle also seems tied to a random event where a plague of hail begins to fall, battering the player and potentially ending a run before you can unlock its secrets. That's roguelike behavior: sometimes the run just ends. The solution is to treat each attempt as practice for the next.

Permanent Upgrades: How to Spend Souls and Lost Wishes

Wondering how to progress if you die constantly? It's all about the economy. The game has two primary currencies that matter for your long-term power:

The demo update significantly increased the chance that random enemies around the map drop Lost Wishes. This is a big deal because Lost Wishes are the rarer resource. The team also rebalanced chest loot tables, so checking every chest is now far more rewarding than it was at first launch.

For a Kernel Hearts walkthrough, here's my recommended spending priority table:

That order reflects a beginner-friendly philosophy: the more time you spend alive in a run, the more you learn about the map and the more souls you earn for the next run.

Multiplayer Co-Op: How to Run Babel with Friends

Kernel Hearts features 4-player multiplayer co-op, and the developers showed it off in the very first public demo in March. If you're planning to play with friends, your Kernel Hearts walkthrough experience changes significantly.

Here are some co-op-specific tips based on how the game is designed:

• Spread out to cover ground. Unlike solo play, four players can each explore a different section of the map, making it easier to find catapults and hidden castles.
• Let the tank draw aggro. Fernet is balanced, but a defensive build can hold enemy attention while teammates slash and summon familiars.
• Share Lost Wishes. Since the full game is longer, coordinating who spends Lost Wishes on team-wide upgrades versus personal stats is important.
• Revive quickly. In the demo, keeping at least one player alive during the hail event was the difference between unlocking secrets and restarting.

The full game's 7 floors are expected to get considerably crazier in co-op, with the developer promising more complex enemy formations and events.

Fortnite Skin Bonus: The Perfect Pre-Order Perk

Epic Games announced a Fortnite collab for Kernel Hearts that gives you the Fernet Outfit in Fortnite as a gift-with-purchase when you buy the game on the Epic Games Store. This is technically a pre-order bonus, and it's genuinely valuable: the skin will cost 1,500 V-Bucks when it arrives in the Fortnite Item Shop on September 26, while the full game is only $19. Here's the step-by-step:

1. Sign in to Epic Games Store with the same account linked to your Fortnite profile.
2. Pre-order Kernel Hearts from its Epic Games Store page.
3. Launch Fortnite to automatically receive the Fernet outfit.
4. Claim the cosmetic in your Locker before the official item shop release.

This is a smart pickup if you play Fortnite regularly, but you can also grab the game on Steam if you prefer that ecosystem.

Demo vs. Full Game: What Changes Expect

Ephemera Games confirmed that the demo only has 2 floors while the full game has around 7. Here's a quick reference table of what changed in the latest demo update:

If you played the original March demo and bounced off, the final demo update is worth a second look. The game runs considerably better on lower-end PCs, and the overall pace of combat feels much snappier.

Frequently Asked Questions

What is the best beginner class in Kernel Hearts? Fernet, the Spiritmancer, is the most balanced vessel in the demo. She dashes with a one-handed sword, can block and dodge effectively, and calls on familiars for support — making her the best choice for your first Kernel Hearts walkthrough attempt.

How many floors are in the full game? The full game has roughly 7 floors, while the demo only includes 2. Developer notes suggest difficulty and enemy variety ramp up significantly in later floors, so permanent upgrades matter.

Does dying reset all of my progress? No. Dying resets your current run's position, souls, and temporary Mementos, but any permanent tech tree upgrades you purchased are kept forever. Lost Wishes you've spent also carry over.

Is there a Fortnite skin included with the game? Yes, if you pre-order Kernel Hearts on the Epic Games Store, you'll get the Fernet Outfit in Fortnite as a gift-with-purchase. The skin costs 1,500 V-Bucks when it hits the Item Shop later, making the $19 pre-order a strong deal for Fortnite players.

Final Thoughts: Your First Run Won't Be Your Last

The best advice for any Kernel Hearts walkthrough is simple: accept that your first few runs will end badly. The demo's mantra — be bold, accept death, hit things — is the real strategy guide. Every crevasse you drop into, every stone angel you fight, and every Lost Wish you collect makes the next run better.

With the game launching September 17, now is the perfect time to practice on the demo, experiment with Mementos, and build a tech tree that matches your playstyle. Whether you're a solo player climbing Babel alone or a squad of four magical girls taking on God together, the journey through Kernel Hearts is all about turning failure into permanent power. See you in Babel.