Kris vs Sans — Deltarune Fan Fight

How to Play Kris vs Sans

In Kris vs Sans, players experience a fan-created battle scenario set in Hometown outside 'Sans grocery store. Unlike the standard events of Deltarune, this standalone project places Kris in a direct confrontation with Sans in the Light World. Kris appears on the left in their striped shirt, holding a knife with a glowing red eye, positioned alongside the red wagon that holds the birdcage containing the red SOUL. Across the street stands Sans, accompanied by a hovering Gaster Blaster skull, noting that "there really is no reason for us to fight". Players who want to revisit the original Undertale encounter can play our Bad Time Simulator.

To begin playing, click once inside the game frame so your browser routes keyboard inputs directly to the player. The battle follows a turn-based Deltarune-style structure where Kris starts with 90 HP. When Sans speaks, press Z to progress through the dialogue lines, or press X to advance through them quickly. When your turn opens, use the Arrow Keys or WASD to navigate the action menu—FIGHT, ACT, ITEM, or MERCY—and press Z to confirm your choice. Pressing X lets you cancel and return to the main menu.

During the defensive phase, your red soul appears inside the combat box, where you must dodge Sans' bone patterns and Gaster Blaster beams. Use the Arrow Keys or WASD to navigate around incoming hazards. A pen-drawn Tension Points (TP) bar on the left tracks your grazing performance; moving close to projectiles without taking damage fills the meter. If you would like to test broader multi-character battle systems with selectable stages, explore the Deltarune Fight Simulator on our platform.

Kris vs Sans Controls

Click inside the simulator window first if your keyboard inputs are not responding.

About the Kris vs Sans Fan Project

In Toby Fox's official Deltarune storyline, Sans appears as a relaxed grocery store keeper in Hometown who maintains a casual demeanor and never enters combat. However, the contrast between Sans' personality and the mysterious sequences involving Kris at the end of each chapter inspired community members to imagine how a confrontation between them might play out. Fan developer The_Fish909 built this project under the title [DELTARUNE] Kris vs Sans VERSION 1, publishing it in January 2022.

This battle places Sans' classic combat motifs inside Deltarune's visual interface. The encounter is set against the backdrop of Sans' grocery store, complete with autumn trees and a CLOSED sign in the window. The visual design draws from the Soulless Kris concept, showing Kris with a glowing red eye, drawn knife, and the birdcage wagon. If you are interested in another dedicated duel focusing on Kris, take a look at Deltarune Kris vs Kris.

As indicated by the author's Version 1 release notes, the project was created as an initial concept build to demonstrate the setting, dialogue, and foundational attack routines. It is structured as a compact encounter rather than an extended multi-phase marathon, making it a focused trial for players who want to see Sans' mechanics rendered in a Deltarune setting.

Combat Mechanics and Sans' Attack Patterns

The mechanics in Kris vs Sans combine elements from both Undertale and Deltarune into a turn-based duel:

Health Pool and TP Gauge: Rather than using Undertale's LV-based 92 HP total from the Genocide run, Kris has a fixed 90 HP pool matching Deltarune Chapter 1 statistics. On the left side of the screen, a custom pen-rendered TP gauge measures grazing proximity. Moving near bones without touching them charges the bar, reflecting Deltarune's evasion reward system.

Bone Rows and Obstacles: Sans deploys white bone hurdles across the combat box. You must time your movements to pass through gaps between sliding floor bones and overhead obstacles, watching projectile spacing carefully.

Gaster Blaster Laser Columns: Gaster Blaster skulls spawn near the borders of the combat arena. When a blaster opens its jaws, you have a short telegraph window to identify its line of fire and move your soul out of that lane before the beam activates.

Single-Phase Scope: In this Version 1 release, the battle focuses on its core attack sequences rather than featuring multiple distinct phases or alternate branching endings. This design keeps the focus on learning the basic dodging patterns and dialogue interactions.

Practical Fight Strategies for Kris vs Sans

• Stay Near the Arena Center: Keeping your soul near the middle of the combat box gives you equal room to steer in either direction when a Gaster Blaster appears along the edge.
• Graze Bone Hurdles for TP: You do not need to retreat far from incoming bone obstacles. Moving close to the tips of bones safely builds Tension Points without shrinking your maneuvering space.
• Read Dialogue Pacing: Sans provides short conversational remarks between attack sequences. Pay attention to text pauses to prepare your hand positions on the directional keys.
• Use Short, Controlled Taps: Oversteering into bone walls is a frequent cause of taking damage. Use small, controlled taps on the Arrow keys rather than holding down a direction continuously.
• Watch for Blaster Alignment: When a Gaster Blaster angles into position, move your soul out of its line of sight immediately rather than waiting for the beam animation to fire.
• Ensure Frame Focus After Toolbar Clicks: If you use browser controls or click outside the player, remember to click back inside the game window so your keyboard commands register during the attack turn.