There is a Maximus Cup this weekend in Tetris 99 on Nintendo Switch. The 41st Maximus Cup is for the Switch game F-ZERO 99. By getting 100 points, you can unlock a F-ZERO 99 theme which includes sounds and a background.
The side quest, as ever, is to try and win. unfortunately, i didn't manage to make it to the top 10 at all during this cup. in the first couple of games i managed to get into the top 20, with the first game being especially difficult. but other than that, i wasn't able to score too highly.