Growing up, I used to play the All-Stars Version of SMB3 all the time
The only problem was that I was terrible at video games so I could never make it past World 3. 
Somewhere along my attempts I learned about the two warp whistles in World 1. 
For a while, I would use those items to help me beat the game but I always wondered if there was a Third Whistle...

The central theme for this hack is Super Mario Bros. 3
Each level takes an idea from SMB3 and utilizes it inside SMW

PS. yes I did eventually learn about the third warp whistle after reading the World 4 letter from the Princess