Okay, so now we have the score attack thingy, how about putting up Sonic Battle? Challenge Mode of course, seeing as that's the only thing you get scored in.
The 'Levels' could be each character, and the 'Divisions' would be the difficulty (One Ring, Two Ring, Three Ring).
And it would be a good idea to impose a rule that no combo card maybe used on Emerl for his Challenge Mode.
And on the tangent of score-only games, why not Spinball? Oh yeah... it sucks... :P