Nintendo sent out the following

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Ready to thrash? We can see it in your eyes. The 25th MAXIMUS CUP might be the monstrous occasion you’ve been waiting for.
With the Tetris® 99 game on the Nintendo Switch system, you’ve got the chance to conquer a fearsome challenge and bring back the spoils of battle – an in-game theme based on the MONSTER HUNTER RISE™ game! To prevail, you’ll need to react quickly and flip those Tetriminos across the screen faster than a Wirebug zips hunters across Kamura Village.
The Tetris 99 25th MAXIMUS CUP event runs from 12 a.m. PT on Oct. 8 to 11:59 p.m. PT on Oct. 11. To participate, Nintendo Switch Online members* just need to play the Tetris 99 online mode during the event period. Players will earn event points based on their placement in each match. Once players have accumulated a total of 100 event points, a new theme will unlock, featuring background art, music and Tetrimino designs inspired by MONSTER HUNTER RISE.
For many Tetris 99 players, you’ve returned to the field of battle many times, with notches on your belt from several of your previous skirmishes. For others, perhaps you’re considering joining your first hunt for glory. On this joyful occasion of the 25th MAXIMUS CUP, we’d like to take this opportunity to thank our contestants both old and new for making Tetris 99 the thrilling experience it is today. Here’s wishing you all a successful hunt!
Be sure to check out the MONSTER HUNTER RISE game, too. Explore lush ecosystems and battle fearsome monsters to become the ultimate hunter. Hunt solo or with friends to earn rewards that you can use to craft weapons and armor. New gameplay systems, such as the high-flying Wire Action and your canine companion Palamute, add new layers to the robust combat that the critically acclaimed action-RPG series is known for.
In addition to Tetris 99, Nintendo Switch Online members can also enjoy online play and the Save Data Cloud feature in a large selection of compatible games, along with access to over 100 classic NES and Super NES games, a smartphone app that enhances features of supported games, and the competitive online battle game PAC-MAN 99. After four decades of iconic gaming memories, PAC-MAN is back in the maze, ready to hunt down those ever-elusive ghosts. But this time, you’ll be competing against 98 fellow players to emerge as the last PAC-MAN standing.
For more information about all the benefits and services available with a Nintendo Switch Online membership, and to learn about a free seven-day trial, go to the Nintendo Switch Online section on the Nintendo Switch HOME Menu or visit https://www.nintendo.com/switch/online-service/.

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See the trailer below