Super Mario Bros 4:54.881 World Record by Niftsky

If you have not seen any Super Mario Bros speedruns it is one of the most optimized classes out there. With less than a half second between the Tool Assisted Speedrun and the Current World Record embedded above there is little room for error. Unless new methods are found it is likely that this run will stand for a very long time.

If you want to check out some of the other records you can see them at
https://www.speedrun.com/smb1