NSMBU - All Castles

New Super Mario Bros. U - All Castles Route

1-1
1-2
1-F
*Grab acorn for safety*
1-3
1-4
Lemmy's Castle
2-1
2-3
2-F
RNG *try and grab the acorn if you can. If run into an enemy, defeat it and hope you get a star*
2-4 secret & normal exit
***NOTE: It doesn't matter the order in which you get both exits as you want to do both of them anyway. Alternatively, you can do the normal exit and get the secret exit after World 3. Won't make much of a difference.***
2-6
Morton's Castle *Use star if obtained star from RNG*
4-1
4-2
4-F
4-3
*grab acorn*
4-4
4-Ghost
Wendy's Castle
*Grab Baby Yoshi, keep Baby Yoshi until 3-5*
3-1
3-2
3-F
3-3
3-5 *lose Baby Yoshi*
Larry's Castle
*Go back to World 2*
2-secret
5-1
5-2 secret
5-7
Iggy's Castle
6-1
6-2
6-F
6-4
6-5 secret
6-F2
Roy's Castle (back entrance)
7-1
7-3
7-F
7-Ghost secret exit
Ludwig's Castle
7-Airship
8-1
8-2
8-3
*NOTE: 8-2 and 8-3 is faster ONLY if you do moat skip in 8-2. If you don't want to do moat skip or can't, then it is faster to get the secret exit in 8-1 to do 8-4 instead.*
8-Castle 1
8-Castle 2

Key Notes:
Ending levels with 77 on the clock will give you an acorn. Very good safety in case you end up running out of acorns