Continuing off of my post about wanting a Mario/Sonic crossover earlier, I don't get why people think it'd be impossible from a game design perspective - they already have the formula in Sonic Generations, make Sonic stages themed on Mario's world, and Mario stages themed on Sonic's world, you don't really have to figure out how Mario would gain the speed to run through a loop-de-loop or how quickly Sonic should be able to shred through brick blocks, just adapt memorable enemies and level gimmicks from each world into one another's level design styles - imagine kicking a red shell through a loopy rollercoaster version of the Mushroom Kingdom, and making it go even faster by outrunning and bumping into it, or wall-jumping up the Mystic Cave pit and being rewarded with a floating hybrid ? monitor containing a 1-up and pipe shortcut.
