Sonic.exe is a creepypasta about a haunted Sonic game made by someone other than SEGA. The story depicts Sonic.EXE as normal Sonic, but with black and red eyes that are crying blood. He kills Tails, Knuckles, and Robotnik in the story. The pasta became immensely popular and tons of fan-art and fan-videos were made about the character. Eventually, a fan game based off the pasta was made, and has received mixed reception, some going as far as saying that the story is real because of it. Recently, the story was deleted off the creepypasta wiki for it being overly clichéd and a bad example of a creepypasta. This caused the Sonic.EXE fanbase to lash out and "go to war" with the entirety of the internet. Many Sonic.EXE clones exist, most of them being a regular character, but with the "traditional" black and red eyes leaking blood.
Sonic.EXE has been made for ModNation Racers many times, but the most popular one is by cottinou.
The mod matches the description of the regular Sonic.EXE, but with some changes, such as having a darker color palette, glowing red eyes, and monster-like teeth.