Good news, hardcore fans: now there are online modes specifically for you (but don't worry, there is something for more casual fans, too.) More specifically, there is a 'For Fun' mode, and a 'For Glory' mode.
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The For Glory mode will be Final Destination only, since that's the popular 'serious' stage to play on—and every stage will have a 'Final Destination' form that is meant for more hardcore play. Woah.