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RPG / BROWSER PROJECT

DELTARUNE Fight Simulator

Open project · unverified

Explore fan-made DELTARUNE and UNDERTALE battle encounters, with boss-rush and attack-practice options in a browser simulator.

Open game project ↗

Research record: 2026-10-12 · Limited check, not live availability

DELTARUNE Fight Simulator — project artworkProject artworkDELTARUNE Fight Simulator

ADDED 2026-10-12

About this browser version

Explore fan-made DELTARUNE and UNDERTALE battle encounters, with boss-rush and attack-practice options in a browser simulator.

Unofficial battle simulator by puskevi. This is not the complete story of DELTARUNE or UNDERTALE. The source describes practice, rewind and custom-party features; encounter coverage was not independently verified.

Developer source & requirements ↗

BEFORE YOU PLAY

The useful details.

This version
Unofficial battle simulator by puskevi. This is not the complete story of DELTARUNE or UNDERTALE. The source describes practice, rewind and custom-party features; encounter coverage was not independently verified.
Game files
The original project advertises browser play without an account. No import of local commercial game files is documented; the host loads the simulator resources.
Device guidance
Desktop suggested. Start with a desktop browser. This recommendation is not a completed compatibility test.
Controls
Use the original simulator’s title-screen and battle prompts. Exact input bindings and a completed encounter were not tested in this check.
Multiplayer
No multiplayer gameplay was verified. This listing describes the developer’s battle simulator and practice features.
Found through
Discovered through the Radiant Games sitemap; independently researched against the original project and developer source.

Social preview artwork supplied by the original project or its creator page; not a screenshot of our gameplay test. Image source ↗

How to get started

  1. Open the original simulator and let its resources load.
  2. Read the title-screen prompts and choose an encounter or practice mode.
  3. Review the current menu and battle instructions before starting.

What to prepare

Read the original game’s current start, save and account instructions. Check where progress is stored before changing devices.

If the project does not start

Original project information and developer documentation were reviewed on October 12, 2026. This check did not include a completed gameplay session, account sign-in or multiplayer test.

Try the original site rather than an embedded preview. Follow its loading and data instructions, and return later if its server is unavailable. Full gameplay is not established by this directory.

Another world awaits.

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