Sonic.EXE: The REBORN Cancelled Windows game - ModDB

Can somebody explain what Sonic.exe is? My 4 year old is obsessed with this (and regular Sonic), internet says it's a game, but it's also a series? : r/SonicTheHedgehog

Sonic.EXE (2011) by DarksArtworks on DeviantArt

Sonic.EXE (Upgraded) by on

Vs. Sonic.Exe/Characters, Funkipedia Mods Wiki

YOU CAN'T RUN: VS Sonic.EXE - Our Sunday Project

Sonic.EXE (Gorehog) Concept by sonicexeartist567 on DeviantArt

Sonic.EXE

I AM GOD Sticker for Sale by loplock

Sonic exe and Sonica exe (short Comic) by Darkness9000A on DeviantArt

Sonic.EXE Sticker for Sale by miitoons