"Irem vs Taito" by Paul Robertson (click for a much larger image). It’s pixelart pandemonium as the titans of these two Japanese video game publishers duke it out!
Hammerin’ Harry versus the Puzzle Bobble Crew! Ninja Baseball Bat Man versus Time Gal's Reika! R-Type crafts versus Darius ships! Mr. Heli versus Invaders! The only battle missing is the kusoge match-up of the millenium, Deadly Towers' Prince Myer versus Beat Takeshi.
Robertson created this image and two others — one based on Konami’s obscure arcade beat’em up Violent Storm, and another NSFW piece for Custer’s Revenge — for the Super iam8bit show. See them all here.
Perfect reminder to watch some King of Famicom.