Super Mario Bros. 35 is a game for Nintendo Switch Online members. The game is a competitive version of Super Mario Bros. with 35 players, similar to Tetris 99. Enemies defeated in one player's game are transferred to another player's. The game also features an item roulette. If the player dies, they lose. The game will become available on October 1, 2020, but it will no longer be playable by March 31, 2021.
The gameplay is the same as the original Super Mario Bros. with 35 players globally. If a player hits an enemy as Small Mario, they are eliminated. If a player falls through a hole, they are eliminated. The game takes all Marios through the entire game until one player is left standing.