There is a Disbelief (Demo) APK for Android available for those who want to experience the fight on the go, though mobile controls are noted to be significantly more difficult.
Because this is a fan-created project, there isn't one single official "game" but rather several highly-regarded versions and mods:
Press the or Enter to start. You can toggle full-screen mode by pressing Alt + Enter . Key Features of the Fight
The Disbelief fight is famous for its emotional depth and evolving difficulty, typically spanning based on the five stages of grief: Create Your Frisk Tutorial - How To Play Disbelief Papyrus
If you prefer not to download files, you can play remastered versions directly in your browser via TurboWarp , which allows Scratch-based projects to run at higher speeds.