SMB3 The Final Kaizo TAS in 45:30
This is a Romhack of Super Mario Bros. 3 made by Mitch Flower Power. He did a TAS of it himself that I felt like improving, completely destroying his hack :).
There's a version with commentary on Mitch's channel: https://www.youtube.com/watch?v=zHkCY...
The hack itself can be found here: http://www.romhacking.net/hacks/2940/
Enjoy!
This is a Tool Assisted recording. Meaning it was recorded using an emulator with slow motion, save states and rerecording.
Visit http://tasvideos.org/ for more information on tool-assisted speedruns, and to watch the many already-existing TASes.