Mega Man X (Known as Rockman X in Japan) is the second series in the long-running Mega Man franchise. The series debuted in 1994 and spawned 11 sequels and spinoffs

The series takes place further in the future after the classic Mega Man series and follows the story of the first successor of Mega Man, known as Mega Man X (or X for short). X is the final creation of Dr. Light before his expected death of old age and was sealed away for thirty years after his completion for he was the beginning of a new race of machines called Reploids, robots with the ability to think for themselves and feel emotions. Although a pacifist at heart, X is forced to fight a tragic war against renegade Reploids known as Mavericks. However, he is not alone in the fight. He is always backed up and supported by his closest friend and ally, Zero, who is ironically, Dr. Wily's final creation.

The gameplay of the series is identical to that of the classic Mega Man series, as the player has to traverse through tough terrain whilst combating Mavericks. For the first two games, the player assumes the sole role of X, whose abilities of weapon copying are identical to that of Mega Man's. In Mega Man X3 and onwards, Zero is introduced as a playable character, offering up a completely different playing experience from any other character thus far.

As Mega Man X, X possesses the X-Buster, a chargable firearm and is able to copy weapons from the bosses his defeats. New to the series is the Armor System. X can collect a set of armor parts that will enhance his abilities and give him new ones as well. As Zero, the flow of the game goes a little differently. While X fights at close-range, Zero fights at close-range with the Z-Saber, a lightsaber-like weapon. In some games, Zero uses the Z-Buster, and its power differs on the game. Unlike X however, Zero does not copy the weapons of the enemies he defeats, but learns a new technique called an EX-Skill, which mimics an ability used by the defeated boss. In addition, most of these EX-Skills use the Z-Saber and they do not use up weapon energy. Both characters in some games have access to a powerful technique called a Giga Crush that damages and destroys all onscreen enemies with a devastating attack.

Mega Man X7 onwards introduces the new character Axl, a Reploid capable of morphing into other enemies through the Copy Shot. Other than that, his gameplay is similar to that of X's.

Though the X series was planned to end with X5 in order to start on the Zero series, Capcom continued the series without Inafune and released X6. The Zero storyline was tweaked only for this game as the games further do not connect. X7 is the first 3D game in the series and nearly deviates from the usual gameplay from the previous series by playing entirely in 3D instead of 2D. The series returns back to its roots with X8

A PSP 3D remake for the first game entitled Maverick Hunter X was released in 2005. Aside from being a 3D remake, the game offers spoke dialog for the characters, altered stages and Vile as an unlockable playable character. The game also includes an unlockable OVA entitled Day of Sigma, which takes place before the first X game.

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