B3313 | The true ending (SPOILERS) 

(SPOILER WARNING)
Once you collect every star in this game, you will find the "true" ending.
With 460 stars, Star Road will become blue and there will be a congratulatory sign.
You can return to Star Road by entering the pipe in the area with the yellow switch.
You do not need to triple jump to get to the 0 pipe. There is a warp roughly where I triple jumped where you stand still and it will take you to the floating island with the 0 pipe.
If you have less than 459 stars the pipe will crash your game.