An extremely easy way to farm power-ups in Super Mario 3D World + Bowser's Fury is with a Lucky Bell and a red trampoline. Jumping and Ground Pounding repeatedly allows Mario to collect 100 coins and receive a new power-up approximately every 10 seconds. pic.twitter.com/rkodZ8CUkj— Supper Mario Broth (@MarioBrothBlog) February 23, 2021
Bowser's Fury mode lets you bank multiple power-ups for use whenever you want, and a trick has been discovered to snag multiple power-ups quickly. All you have to do is find one of the red trampolines in the game and ground pound it. You gain a power-up for every 100 coins you get, and ground-pounding a trampoline makes a long string of coins appear every time. If you stick with it, you can get a new power-up roughly every 10 seconds!