This is a tool-assisted speedrun, made on an emulator, using frame-by-frame shooting, savestates, and rerecords to overcome reaction time and human error. As such, it is purely a form of entertainment, and is not designed to show skill.
This is a warpless long timeattack of SMB3j, played by Tokushin.
There are a few curious features in this movie.
The movie also takes advantage of some glitches in the game. If you're interested in how they work, see the Super Mario Bros. Tricks page.
This movie has been downloaded from: http://www.geocities.co.jp/Playtown-Denei/3370/SuperTec.htm#Smb3jtec