Sonic.exe 3.0 Source Code [patched] May 2026

The Sonic.exe 3.0 (also known as Vs. Sonic.exe V3) source code refers to the unreleased and eventually cancelled version of the popular Friday Night Funkin' (FNF) mod. Official Status and Availability

Cancellation: The development of the V3 update was officially cancelled in July 2022 due to internal team stress, leaks, and burnout.

Cancelled Build Release: After the cancellation, the developers released an unfinished "Cancelled Build" on GameBanana, which contains many of the assets and songs intended for the 3.0 update. Source Code Repositories

Since the original project was open-source (using Haxe/Psych Engine), various community members have hosted the code and ports on GitHub:

DANIZIN23/Sonic-exe-2.5-3.0: A repository containing code for the 2.5/3.0 builds with instructions for compiling on Android.

Zexlo/psych-engine-port: A port of the Sonic.exe mod to the Psych Engine, which is a common base for FNF mods.

duckiewhy/exe-2.5-code: Specifically contains source files like PlayState.hx for the v2.5/v3 era of the mod. Requirements for Compiling

If you are looking to build the source code yourself, you generally need the following tools as specified in repository documentation: sonic.exe 3.0 source code

Haxe & Haxelib: The primary programming language and library manager used for FNF mods.

Visual Studio Community: Required for C++ compilation on Windows.

Specific Libraries: Common libraries required include extension-androidtools and extension-videoview.

Command: Running lime test windows (or lime build android for mobile) in your terminal is the standard way to compile the project.

0 build, or do you need help setting up the environment to compile it? duckiewhy/exe-2.5-code - GitHub

The Sonic.exe 3.0 source code refers to the unfinished, leaked, and later "restored" builds of the popular Friday Night Funkin' (FNF) The Sonic

mod. While the original development was canceled in July 2022, various community-maintained repositories and ports now host the code, primarily using the Psych Engine or Kade Engine. Technical Breakdown

The codebase is a hybrid of several languages and scripting formats common in the FNF modding scene:

Haxe & C++: The core engine logic is written in Haxe, which compiles to C++ for the final executable. This handles the rendering, audio syncing, and heavy system processes.

Lua Scripting: Many of the "3.0" builds (especially Psych Engine ports) rely heavily on Lua for stage-specific events, custom HUDs, and unique mechanics like the flash effects or camera zooms during certain songs.

JSON Configuration: Character data, song charts, and stage layouts are typically defined in .json files, making it easier for community members to add characters like Fatal Error or Chaotic without recompiling the whole game. Key Features in the 3.0 Codebase

Advanced Mod Support: The engine allows users to add "weeks" using only external Lua files, which prevents them from needing to touch the compiled source code.

Visual Enhancements: The code includes logic for better hair physics, specific stage lighting triggers, and "Event" notes in the chart editor that trigger hardcoded actions like jumpscares or screen distortions. Memory Corruption: 3

Restored Content: Community versions like Sonic.exe Restored have integrated assets for characters that were planned but never officially finished, including Lore-specific revivals by Sonic.exe's "godlike" powers. Legacy and Availability

Why the 3.0 Version Matters (Technical Perspective)

To understand the code, you must understand the artifact. Version 3.0 is distinct from 2.0 (the "X" version) and the later "PC Port."

Memory Corruption: 3.0 is famous for its "bleeding" UI. Programmatically, this is achieved by manipulating the VDP (Video Display Processor) registers on the fly. The source code reveals how the hacker overwrote palette lines every frame to create the illusion of dripping blood without lagging the 68000 CPU.
The "False" Ending: The game utilizes a checksum verification trick. If the player reaches the "Hedgehog Heaven" zone, the code triggers a soft reset that jumps to a specific memory address containing the "You’re Too Slow" screen. Studying the disassembly shows how the hacker bypassed the standard level sequence pointers.
The Chase AI: Unlike modern pathfinding, the "Sonic.exe" black-eyed sprite in Zone 3 uses a simple "Move toward player X/Y" function. However, the 3.0 source shows a velocity hack that makes the entity ignore collision flags, allowing it to clip through walls.

2. The "Triple Trouble" Spaghetti Code

The crown jewel of the 3.0 update was the song "Triple Trouble," featuring Xenophanes (the crystal-covered Sonic). From a source code perspective, this song is a masterpiece of chaos.

Standard FNF charts have one "Opponent" and one "Boyfriend" (the player). The source code for "Triple Trouble" had to be hacked to support a shifting roster.

Character Swapping: The code utilizes a switch statement loop that triggers mid-song. Every few sections, the game changes the boyfriend or dad variable to swap the sprites on the fly without reloading the level.
The "Soul" Characters: The code spawns the disembodied heads of Tails, Knuckles, and Robotnik not as characters, but as UI elements. This is a clever hack; by making them part of the HUD (User Interface) rather than the stage, they can animate independently of the stage lighting and move across the screen without colliding with the background physics.

How to Access the "Source Code" (A Legal Guide)

Since the original assembly files are lost to time, developers rely on Disassembly Projects. Fortunately, the Sonic ROM hacking community has fully disassembled Sonic 1. By applying the 3.0 patch to the disassembly, we can reconstruct the code.

Introduction

The Sonic.EXE franchise began as a classic internet creepypasta — a haunted ROM of Sonic the Hedgehog where a demonic entity tortures Sonic’s friends. Over the years, fangame developers expanded the mythos. Among the most infamous is Sonic.EXE 3.0, a fangame that pushed the boundaries of psychological horror, meta-narrative, and game design — until its source code allegedly “leaked,” igniting controversy.

This write-up explores the origins of Sonic.EXE 3.0, what the source code reveals about its design, and why its release still haunts fan communities.

Deep Dive: Notable Code Snippets (Reconstructed)

Based on community decompilations of the 3.0 binary, here is what the logic looks like in pseudo-assembly. Warning: This is reconstructed for educational use.

3. Unused “Exe Face” Renderer

Unlike other Sonic.EXE games that just display a static image, 3.0’s source includes a dynamic shader script.
The shader would slowly distort the player’s screen and embed a low-res “X” face into the game window’s corner.
Comment: “Final boss form — glitches the actual window, not just sprite.”