Tetris 99 is a multiplayer version of Tetris for the Nintendo Switch. It was released on February 13th, 2019 for Nintendo Switch Online subscribers. It features a single free mode in which you are pitted against 98 other players online. Players attempt to eliminate their opponents by clearing lines to send garbage blocks to players they have targeted (with 4 options for automatic targeting and manual targeting available).

There are 2 events that have happened called "Maximus Cups."

There is also a DLC pack called the "Big Block" which currently contains 2 offline modes called CPU Battle and Marathon.

There are 2 game themes, 1989 and Splatoon, which are both won in the Maximus Cups.