Cinderbrick Fort is another short level with a core; Other than sometimes uncooperative ground, there is not much to it in a speedrun, except in NG+ categories, where a good part of it can be skipped.

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[Cinderbrick Fort, New Game]

Overview

At the start of the level, wait for the 3 gates to open. Roll past all of the enemies until you reach a switch, and a cage. Use the switch, clean out the obstacles to the right of the cage while you wait for it to rise, and pick up the Scrap Musket. This weapon saves quite a lot of time in later levels.

NG+ - In these categories, of course, you can ignore the Scrap Musket, since you already have it. Two would be an overkill. Also, you're not allowed to have two.

Keep moving until you reach another gate. Quickly destroy the yellow turret to open it(the gate can be skipped by falling, but that would be slower). In NG, use a stationary Hammer overhand attack and a Musket shot, in NG+ you can use any attack.

Pick up the Core. If you didn't level up here, you can roll around this gate from the right side, before it even opens. This is a really easy to do.

Continue rolling through the rest of the level(this part is pretty long in NG, but there is nothing you will have to know other than go fast).

NG+ - At some point you will execute the two Cinderbrick Fort Pike Vaults to a certain platform that you can't otherwise reach, to skip about half of the level. Watch out to not attempt the first one if you only have one Black Tonic left, as you can softlock the level and have to restart it(you'll be stuck on the empty platform without a way to leave it).