Sonic x Shadow Generations has already sold one million units, Sega has announced, despite only coming out today, October 25.

Being a souped up remake of 2011's Sonic Generations didn't slow down the Blue Blur on the sales front, with the figure covering worldwide sales on PlayStation 4, PlayStation 5, Xbox One, Xbox Series X and S, Nintendo Switch, and PC.

Alongside the remake portion comes Shadow Generations, a brand new chunk of gameplay similar to how Super Mario 3D World was enhanced by Bowser's Fury in the Nintendo Switch remake.

"Sonic x Shadow Generations is a title that combines two games: Sonic Generations, where players can enjoy speedrunning various stages with Classic Sonic and Modern Sonic, enhanced with new elements, and Shadow Generations, a completely new game featuring the dark hero Shadow racing through dynamic environments," the official synopsis reads.

"The story begins as a mysterious creature called the Time Eater creates distortions in time and space, setting off separate adventures for Sonic and Shadow. Players can look forward to a high-speed action-adventure with distinct gameplay experiences and narratives."

The game has reviewed well critically too. "Sonic x Shadow Generations takes an already excellent game and spring jumps it to new heights with a creative Shadow campaign and an appreciable graphical upgrade," IGN said in our 9/10 review.

Sonic x Shadow Generations is the latest hit for Sega; the Atlus-developed RPG Metaphor: ReFantazio also sold one million copies on launch day.

Ryan Dinsdale is an IGN freelance reporter. He'll talk about The Witcher all day.