Tetris 99 is an official Tetris game for Nintendo Switch. This version of Tetris on Switch was released as a free title for all Nintendo Switch Online subscribers and features an online multiplayer mode for 99 players.

Tetris 99 is based on the classic puzzle game Tetris, which gained mainstream popularity when it debuted on the Nintendo Game Boy in 1989. Several Tetris games have experimented with online multiplayer modes, with Tetris 99 being the first in the franchise to support online matches with as many as 99 people.

In that regard, Tetris 99 is similar to popular battle royale video games like Fortnite, where players also compete to be the last person standing. While most battle royale games are action games, Tetris 99 is often referred to as a battle royale puzzle game.

A few months after Tetris 99's release, several offline modes were added as downloadable content (DLC). The Big Block DLC bundle adds traditional local multiplayer modes for up to eight players on a single Nintendo Switch, along with a variety of challenging modes for solo players.