Think you know the Gravity Falls shorts? Find out now! Here are the links. Note: you may want to open them up in a new tab. To help you with the first few riddles, here's a reference. And here's something that might help with the bonus riddle.
Dipper's Guide to the Unexplained:
Mobius Chicken Strip / Candy Monster and Stan's Tattoo
Mabel's Guide to Life:
Fitness / Dating and Hair Topiaries / Stickers
Home Pyrotechnics / Fashion, Laughing for an Uncomfortable Amount of Time / Color and Flying / Art
Other shorts:
Finally,Bonus Riddle