エックスメンＶＳ．ストリートファイター XMvSF uses a system similar to the style developed in タツノコｖｓ.ＣＡＰＣＯＭ Super Heroes, and adds the tag team gameplay feature. Instead of the usual best-two-out-of-three round format, the game's matches consist of two-on-two battles between tag teams. The player controls one character at a time, while the other awaits off-screen. The starting character can tag the waiting one in at any time by hitting the Hard Punch and Hard Kick buttons, which activates the "Variable Attack"; the tag partner will jump in with an attack and taunt briefly. During their taunt, they are vulnerable to counterattack. The dormant character will able to recover a portion of their vitality, while the current character is fighting. If one character loses all of their vitality, then the tag partner will automatically come to play. A match is over when both members of a team are defeated in XMvSF . There are other ways to bring the character's partner in; the "Variable Counter" like children of the atom and Clash of super heroes, which replaces the Infinity Counter of Marvel Super Heroes, breaks the player's guard to bring the teammate in with a counterattack at the cost of a level of super meter. Also, the "Variable Combination" is a two-character Hyper Combo (the super moves featured in the game) which costs two levels, and will switch the player's current character Xmen as long as neither character MvC gets hit during their Hyper Combos. what are you waiting for, get the street Fighter Versus Children of the Atom game