Get a mushroom,fire flower, mini mushroom, 1 up mushroom, mega mushroom,cion block head,tail leaf, and super tail leaf. My best is 14:11. Good luck!

12:29 PB =)

My route:Grab a mushroom in 1-1.Grab the first 2 star coins.Grab the fire flower after the check point.Ground pound the block next to the pipe leading to the third star coin.1-2 Grab all three star coins.Get a mega mushroom and get your 1 ups from the yellow pipe before the rising and falling platforms.1-3 Get 0 star coins and beat the level while grabbing a leaf.1-Tower 0 star coins.Go through the normal exit.Beat 1-4 with 0 star coins.Use all 5 star coins to unlock a seperate path.Beat 1-A with no star coins.Get a mini-mushroom from the toad house.Beat 1-Castle with no star coins.Go to 2-1 and after hitting the checkpoint go to the sub area with the golden flower.Die 5 times from the checkpoint get super leaf.

Got a 12:11 by getting the super leaf in 1-4 instead of at the end,since I'm pretty sure top super leaf speed is faster than top normal speed.Plus the start of 1-4 is closer to a death pit.

I think this would be more relevant here:

https://www.speedrun.com/nsmb2ce/forum

11:36 PB Used white leaf at castle to kill Roy instantly.

Yeah, this suggestion belongs in category extensions. If you have a video of you completing the run, you can send it to me in messages and I can add the category. I'll lock this thread for now, though.