Remember how Sumo Digital kept dropping hints that they really wanted to do a fighting game? Looks like it was an idea which was seriously being considered if this discovery is anything to go by.
A design company by the name of Funsolve recently uploaded a bunch of concept art images for a number of Sega games, including the House of The Dead Overkill, Sonic & Sega All Stars Racing Transformed and more interestingly, two completely unknown All-Stars concepts, All Stars Brawl & All Stars Football.
The football concept is exactly what you would think, the Sega All Stars playing football with the trademark weapons being used during the game.
The brawl one however is the more interesting concept, with Super Sonic used to show the characters can fly around the stage as well as stand on platforms using power ups and throwing objects at opponents.
One annoying part of the concept art is that the brawl concept art was laid out like a comic book… only the second part of it is cut off and we really want to see how that fight was going to turn out.