Recently I thought of a much better route for 9-1 any% so I will put it here. (Star coin information included)

World 1 (1)

1-1 (123) 1-2 (123) 1-3 Normal (123) 1-3 Secret Star House 1-Cannon

World 5

5-1 Use Star 5-2/5-3 5-F 5-4 5-Ghost House Secret 5-Cannon

World 8

8-1 8-2 Secret 8-7 8-A 8-C

Credits

World 1 (2)

1-F (123) 1-4 (123) 1-6 (123) (interchangeable) 1-5 (123) (interchangeable) 1-C

Warp to w9

World 9

9-1

This saves time over the original route because of map movement, save prompts after 1-F and 1-C, and the world 2 cutscene is shorter.