The Mega Man X Series has no doubt a successful one, which leads to many fan-made products and even spin-offs. One of those is Mega Man X - Rush to Battle, fighting mini-game.
This title includes many charracters from the original series, that you can take control of X, Falcon X and Shadow X from Mega Man X6, Zero, Black Zero, or even the archenemy of the Reploids, Sigma into the battle. Each of them represents many skills and many other special moves, depending on the player's skill as well.
The game's low resolution is quite a problem, but for fans, this doesn't matter at all.