Go Go Go

Great SBS training!
Last step is so tricky!

I finally got it to work, but I don't understand why the last stair is so hard. Shouldn't it be the same as the other 2?

@MekaSage There is a stair or other things under the last stair.
The last stair is very hard to cross.

I tap very fast between stair and grass.
B fly across

I pulled the stair up

+ if under it using a motor maybe I will have trouble.