Factory
Level Ups:
Mallow [13]: HP (after Countdown)
Geno [14]: ATK (after Machine Made Yaridovich)
Peach [16]: SP (after Earthlink)
Battles:
Countdown
Machine Made Yaridovich
Cloaker, Domino, & Earthlink
Proceed through Factory, jump on screws as little as possible.
In the room with alternating paths, the upper route is faster while the lower route is easier.
NOTE: The video on the left is from an old route, you no longer need to get Ultra Hammer or do any menuing before Countdown. However, the movement is still a great example.
(video credit: Lack)
Proceed to Countdown. The jump onto the bolt is tighter than it looks.
(video credit: Mill)
Continue through the Factory.
Attempt the Factory Wrong Warp.
Attempt Bowyer Skip.
(video credit: Lack)
BOSS BATTLE: MACHINE MADE YARIDOVICH (800 HP)
Proceed to Inner Factory.
BOWSER'S KEEP (2) | FACTORY | INNER FACTORY