after I unlocked all the music, stages, and characters, I didn't care about getting anything else. So I still have a bunch of challenges to do, and I didn't get a single boss trophy. Doing stuff like that actually sucks the fun out of the game imo. It's a great game and tons of fun, but when you have to play hardcore single player to do stuff, it's not very fun anymore. AKA, beat classic, all star, 100 man melee and boss mode with all characters. That is anti my definition of fun. That's just tedious

THE JACKEL