10. Super Mario 64 - Akkikan/ WhiteAris
In 2012, WhiteAris uploaded a video online of himself completing Super Mario 64 in 15:31, smashing the world record. The following year, this achievement was seemingly beaten by Akkikan, who won the game in 15:22.
Save for Akikan and WhiteAris' unrealistic level of skill, no discrepancies were found in the video footage. Upon further investigation, edits were found in the audio files of both runs, indicating that the recording had been spliced. This means the players took the best runs of certain sections and merged them together to give the impression they were single playthroughs.
In the speedrunning community, spliced playthroughs aren't considered cheating if this information is shared with the viewers. But because Akikan and WhiteAris claimed their runs were attained in one go, their records were disqualified.
Although the pair denied all allegations, they acted very suspiciously after these claims were made. Not only did they delete their playthroughs from their channels, Akikan ordered anyone who uploaded his run to take it down because he thought it wasn't good enough (even though it was considered the world record at the time!)