Here are some awesome shortcuts. *= Mushroom/Power boosting required
Figure-8 Circuit -None that I know of.
Yoshi Falls -Under the first waterfall, not the second, then the third.
Cheep Cheep Beach -Straight through the bay*
Luigi's Mansion - When getting out of the mansion, hang a left and go behind the graves*
Desert Hills -Behind the pyramid/over the hills*
Delfino Square -Through the alley/over the dock*
Waluigi Pinball -None that I know of.
Shroom Ridge -Through the field before the tunnel*
DK pass -Over the hill with the item block on top of it.
Tick Tock Clock -None that I know of.
Mario Circuit - None that I know of.
Airship Fortress -This is a really dull cup, isn't it? NO SHORTCUTS.
Wario Stadium -Through the dirt in the spinning fire area*
Peach Garedens - Though the grass after the second bridge*
Bowser Castle -In the spinning room, the second door.
Rainbow Road - All the good shortcuts are in the retro GP. None here.
Post Quality: This is my mission.
Figure-8 Circuit -None that I know of.
Yoshi Falls -Under the first waterfall, not the second, then the third.
Cheep Cheep Beach -Straight through the bay*
Luigi's Mansion - When getting out of the mansion, hang a left and go behind the graves*
Desert Hills -Behind the pyramid/over the hills*
Delfino Square -Through the alley/over the dock*
Waluigi Pinball -None that I know of.
Shroom Ridge -Through the field before the tunnel*
DK pass -Over the hill with the item block on top of it.
Tick Tock Clock -None that I know of.
Mario Circuit - None that I know of.
Airship Fortress -This is a really dull cup, isn't it? NO SHORTCUTS.
Wario Stadium -Through the dirt in the spinning fire area*
Peach Garedens - Though the grass after the second bridge*
Bowser Castle -In the spinning room, the second door.
Rainbow Road - All the good shortcuts are in the retro GP. None here.
Post Quality: This is my mission.