I stopped at level 21... probably the first time I've ever put down a game before reaching "the end". I imagine that I could have just kept going indefinitely.
I take back what I said before, it was snarky and nobody forced me to play this.
Anyway, I figured out after a while that using the specials is unnecessary unless you're going for the perfect badge... just time your hits well and roll right over the opponents.
 "Oroboros"){kind=icon}
 "BoomsticK"){kind=icon}
 "Thing-Thing Arena 2"){kind=icon}
 "P.O.D."){kind=icon}
 "Death Vegas"){kind=icon}
 "The Great Siege"){kind=icon}
 "Hero's Arms"){kind=icon}
 "Civiballs"){kind=icon}
 "Fancy Pants Adventure: World 2"){kind=icon}
 "Bible Fight"){kind=icon}
 "Mud and Blood 2"){kind=icon}
 "Cell Warfare"){kind=icon}
 "Death Dice Overdose"){kind=icon}
 "Mastermind: World Conquerer"){kind=icon}