Mario & Sonic at the Rio 2016 Olympic Games is like a minigame compilation based of 2016 Rio Olympics.
This game is not forgotten but it's still underrated.
The only reason why it's there because other than the subreddit r/Roms via a terrible 1fichier link there's no other other way you can find it.
The version here is the US version without any updates (reason present in "Rejected Roms" page).