Smashmate (スマメイト) is a Japanese community website for Super Smash Bros. Ultimate designed primarily for online play. A Twitter account is required to register, as well as verify if the user has a LAN adapter to display on their profile. Founded by Occho during the Smash 4 era, the website features a season-based Elo ladder, as well as an online tournament scene for players with particularly high ratings. The Elo ladder uses a seasonal system. Notable online tournaments such as Tamisuma and Maesuma are run directly on the website through a tournament system. Additionally, players have the option of filling out Player Diaries to track their progress, and opponents have the option of posting their thoughts on the match on the player's profile. Players that remain high on the ladder will earn achievements on their profiles as well. Top players such as Tea and Shuton frequently use the website.
Smashmate uses its own ruleset for rated games on their ladder, which are often adopted by tournaments as well. It's a "Best of 3" set that uses 3 stocks, a time limit of 7 minutes, and Stage Hazards are set to off. Characters can be changed freely. In the event of Sudden Death, the player with the lowest percentage wins. If their percentage is the same, then Sudden Death is played out.
For the first game, players will agree on a stage to play on. For games 2 and 3, the loser picks the stage. Dave's Stupid Rule used to apply until the 11th rated season, where it was abolished.
For rated battles exclusively, players can set up to 2 stages to ban on their Smashmate profiles for the Starter and Counterpick stages, which neither the player nor the opponent can select for the duration of their set. Thus, up to 4 stages can be set. Banned stages are shown to both players alongside a generated list of stages to choose from. During matchmaking, the banned stages cannot be changed.