Squad Strike (団体戦, Team Competition) is a multiplayer mode in Super Smash Bros. Ultimate that enables players to fight against each other with a squad of either 3 or 5 fighters. The mode can be played in three formats: Tag Team and Elimination, which both have the winner of each round stay in, ending when one squad eliminates all characters from the other, and Best Of, which has characters from both sides swap out each round, and ends after all 3 or 5 fixed matchups are played.
In all formats, after the characters are selected for each squad, each player selects the order of fighters within the squad via discrete button inputs. The order is not revealed until both players have confirmed their choices. From that point onward, the order of the characters is fixed.
Replays can only be saved in Elimination and Best Of formats.
In this format, the entire 3v3 or 5v5 match takes place in a single continuous battle, with each character loading seamlessly onto the field after the previous one is defeated. This concept was formerly utilized in the final battle of Smash Tour in Super Smash Bros. for Wii U and as a single/co-op feature in Adventure Mode: The Subspace Emissary from Super Smash Bros. Brawl in stages with multiple characters or in all of the post-game. It is also used in the final battle in World of Light. Players do not change characters until they are defeated, creating a "winner stays" format within the single battle, and the ultimate winner of the match is the player who eliminates all fighters from their opponent's squad.
This format is similar to Tag Team, but each round is a separate battle, with a return to the menu screen each time a fighter is defeated. Otherwise, it has the same features, with the winner of each round proceeding to take on the next character from the enemy squad, and the ultimate winner being the one with the last fighter(s) standing. The winning character keeps their current stock count from round to round, but can optionally recover some damage between rounds.
This format features a fixed series of 3 or 5 rounds, with each round matching up a new character from each team. Players will return to the menu screen between each round. The winner is the player with the most rounds won after all matchups are played. The odd numbers available as squad sizes ensure this format cannot end in a tie.
Squad Strike is played in Stock or Stamina mode with 1 stock per character, with an optional time limit as well as all other standard Smash mode rules. Squad Strike's advanced rules allow choosing the number of stages to be played in Elimination and Best Of formats; up to 3 can be selected and will be played in order, cycling back to the first if more than three battles are necessary. In Elimination format, the amount of damage the victor recovers after each round can also be adjusted (from 0 to 100 in increments of 10).
Number of players
Although Squad Strike has only two player slots, an option for quick controller switching is available on the menu screen between rounds in the Elimination and Best Of formats, allowing teams of players to hand off control with one character per team member. If using the Elimination format, this creates a style of gameplay comparable to a crew battle.
In competitive play
Tag Team Squad Strike has seen dedicated tournaments. However, due to how Echo Fighters play almost identically to their base counterparts, many tournaments such as Pound and Frostbite have opted to prohibit running them with the original fighter as a team.