Nintendo sent out the following

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It’s a star-filled fun fest! Mario Party Superstars is coming to the Tetris® 99 game for the Nintendo Switch system in a 27th MAXIMUS CUP party! Compete to become a superstar and unlock a Mario Party Superstars theme.
The Tetris 99 27th MAXIMUS CUP event runs from 11 p.m. PT on Dec. 9 to 10:59 p.m. PT on Dec. 13. To participate, Nintendo Switch Online or Nintendo Switch Online + Expansion Pack 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 the Mario Party Superstars game.
In Mario Party Superstars, try your hand at a superstar collection of minigames from throughout the Mario Party series. Roll your dice and race to get the most stars (and sabotage your opponents) on five game boards. Whether you’re sharpening your skills solo or challenging your family at game night, there’s nothing quite like being the last one standing on the board or in a minigame match. Want to play with far-off friends and family? All modes can be played online!*
In addition to Tetris 99, any Nintendo Switch Online member 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.
The new Nintendo Switch Online + Expansion Pack membership plan features all the same great benefits of a Nintendo Switch Online membership, but with access to classic Nintendo 64 and SEGA Genesis games, as well as access to the Animal Crossing: New Horizons – Happy Home Paradise paid DLC, at no additional cost.
For more information about all the benefits and services available with a Nintendo Switch Online or Nintendo Switch Online + Expansion Pack membership, and to learn about a free seven-day trial for Nintendo Switch Online, 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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You can see the trailer here