I still remember my first Undertale genocide run — it messed me up. Then I went into Deltarune thinking it would be safer. Big mistake. Because once Chapter 2 dropped, the community found out that a dark route was hiding right under our noses, and I had to see it for myself.

In Undertale, the Genocide Route — sometimes called No Mercy — is exactly as awful as it sounds. You don’t just fight monsters; you actively walk through every area, searching for enemies until the kill counter drops to zero. The music shifts to that eerie, slowed-down tone, and the SAVE points show how many monsters are left. If you somehow survive the brutal fights against Undyne the Undying and Sans, you get an ending that is both spine-chilling and deeply tied to the lore. Worse, it can permanently alter future save files, meaning you can never truly take back what you did.

Deltarune Chapter 1 refuses to let you go full villain. I tried — plenty of players did — but the monsters escape or stop the battle before you can land a killing blow. So for a while, I thought Deltarune just didn’t have a genocide route.

Then Chapter 2 arrived, and Noelle joined the party. That’s when things got icy. Players discovered that you can command Noelle to use her IceShock magic on enemies, freezing them solid. At first it looks almost harmless, like a cartoonish freeze effect. But then the conversations between Kris and Noelle start to rot. Normally their chats are sweet, nostalgic, and warm. On this route, they’re cold in the worst way. At one point, Kris can push Noelle to take an item that makes her stronger, even though she is clearly uncomfortable. After she freezes an enemy solid, her line “Did I just…” tells you everything: she knows she did more than freeze them.

That moment was my “oh no” point. I’m not gonna lie, I sat there staring at the screen for a second. The game doesn’t shout at you. It just quietly lets the horror sink in.

The Snowgrave route follows Undertale’s Genocide path in other ways too. Instead of solving puzzles normally, Kris makes Noelle solve them by freezing their mechanisms, just like you’ve been commanding her to freeze enemies. The car puzzles in Cyberworld stop blocking your path. The cheerful music is replaced by a slowed, distorted version. Some objects even tell you how many enemies still need to be eliminated in the area. It’s the same mechanical language of a kill counter, but wearing Deltarune’s brighter clothes.

Then comes Berdly, the obnoxious nerd with a crush on Noelle. The fight against him is the point of no return. If you finish it using the new Snowgrave spell, the route locks in. You can’t back out and pretend you were doing a normal playthrough. Kris still reunites with Susie and Ralsei afterward, but the dialogue is permanently off. And instead of fighting Queen as the final boss, you face Spamton NEO — a mercilessly difficult fight that feels like punishment for what you chose to do.

The consequences don’t stop when you leave Cyberworld. Back in Hometown, you can walk around and find unsettling details tied to Noelle’s Snowgrave spell. The town feels heavier. NPCs react differently. It’s not just a “bad ending” cutscene; it’s a slow creep into something wrong.

Here’s a quick breakdown that helped me explain the difference to a friend:

Element	Normal Chapter 2 run	Snowgrave / Weird Route
Noelle’s dialogue	Warm, nostalgic	Pressured, fearful
Puzzles	Solved normally	Frozen by Noelle
Music	Upbeat, catchy	Slowed, distorted
Enemy encounters	Fought normally	Frozen with IceShock
Final boss	Queen	Spamton NEO
Hometown return	Lighter tone	Unsettling details

I love Undertale and Deltarune because they understand that tone matters. The Snowgrave route isn’t scary because of gore or jumpscares. It’s scary because you have to repeatedly override Noelle’s clear discomfort. You are the one pushing a childhood friend to hurt people. The game gives you every chance to stop, and if you don’t, it remembers.

As of 2026, I’m still thinking about that route more than I’d like to admit. Whether future Deltarune chapters will include their own version of a Genocide Route remains an open question, but Chapter 2’s Snowgrave path is proof that Toby Fox knows exactly how to make a colorful RPG feel like a horror game. If you need some Halloween chills any month of the year, boot up Chapter 2, listen for the music to change, and maybe keep the lights on. 😱