Retro games pixel art GIF on GIFER - by Stonebrand

Dreamy Videogame GIFs Transport You to Another World

Huge fighting games backgrounds animated gif collection

Pixel art graphics for Sberfight game website on Behance

Calculating the Pixels Per Unit (PPU) for a Background in Unity, by Chris Hilton

ArtStation - Idle animation + background

Background mugen GIF - Find on GIFER

File:Trefoil knot conways game of life without background and fitting.gif - Wikimedia Commons

Meadow Game Background - Parallax Demo by Muhamad Rizqi on Dribbble

Forest Game Background - Parallax Demo by Muhamad Rizqi on Dribbble

Minecraft Gif - IceGif