
All deconfirmed characters have the possibility to return as expansion characters. Mega Man X was intended to be replaced with Model X, who was ultimately replaced by the classic Mega Man which has sparked controversy regarding whether Mega Man should be regarded as a newcomer or veteran. Five characters from the past game are confirmed to return: Young Link, InuYasha, Blue, Blade and Mr. There are 2 types of characters: starter characters, which are available for use from the beginning, and unlockable characters, which are accessible only after being unlocked. Each character has a number of special attacks, standard attacks and a unique special move called a Final Smash. The character selection screen as of Beta.The characters are the fighters which represent the universe they belong to.

When a player loses all of their lives, they are "defeated", and the match concludes when there is only one player, or one team left standing. In Stock mode, each player is given a chosen amount of lives, and every time they are KO'd or self-destruct, they lose a life. Should two or more players accumulate the same amount of points, there will be a Sudden Death match to determine the winner. At the end of the designated time limit, the player with the most points wins. In Time mode, each player receives a point when they KO an opponent, and loses a point if they are KO'd, or if they self-destruct.

Matches can be played in either Time mode, Stock mode, or a combination of the two. Players can customize their controls in the menu. P-2 uses the 1 key on the numpad for special moves (or activating a Final Smash), numpad 2 for standard attacks, numpad 3 for shield and numpad 4 for taunt. The O and P keys still remain in P-1's possession, however, as the O key is used for special moves(or activating a Final Smash), the P key for standard attacks, the I key for shield, and the 1 key for taunting.

The W, A, S, and D keys are now assigned to Player 1's movement, while the arrow keys move a second player. The controls are also different from its predecessor. The higher the percentage, the easier it is for a character to be knocked off the stage. As the character is attacked, damage accumulates, and the percent value increases. Unlike most traditional fighting games, a character's health is measured by a damage percentage counter. Super Smash Flash 2's gameplay is very similar to the official Super Smash Bros. The following explanation is based on the gameplay of the demo.
