Co-op is a little scene i made as a homage to Sega's Mega Drive (Genesis), co-op games and the importance they had during my childhood. It was my second videogame (the first was Sega's Master System) and i spent endless hours playing it, normally the co-op games displayed in the images with my cousins and friends.
ps. I know Sonic 2 isn't the best example of a co-op game, but still it was my first game and i played it a lot with friends, even though playing as Tails sucked :)