NSMBU - All Castles Route 2

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
Catch Nabbit 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*
2-5
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
Catch Nabbit 2
3-1
3-2 (Use P-acorn)
3-F
3-3
3-5 (Use P-acorn)
Larry's Castle
*Go back to World 2*
2-4 secret
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