Master Hand (マスターハンド, Master Hand) is a hand-like entity who acts as the main recurring boss in the Super Smash Bros. universe. He is the final boss of the 1P Game in Super Smash Bros. and of Classic Mode in Super Smash Bros. Melee, Super Smash Bros. Brawl, and Super Smash Bros. 4. He appears on Final Destination, where the player must defeat him by taking his HP to 0.
Despite appearing in all four games of the series, considerable mystery surrounds the character, due to a lack of official explanations. The fact that the intro to Super Smash Bros. has Master Hand appearing to set up a stage and the playable characters has caused some to speculate that the world of Smash and the World of Trophies in the Subspace Emissary are Master Hand's creation, as he is the leader of the latter. Also, his Brawl trophy info (shown below) implies that he is not using his full power against the smashers and is merely toying with them for his own enjoyment. As seen in Super Smash Bros 4, it is possible that his true power is actually Master Core, however, there is little to no information about the relation between the two.
Super Smash Bros. Melee sees Master Hand reprising his role as a boss in Classic Mode. He is fought in the final battle on Final Destination. Defeating Master Hand once again causes the screen to fade to white as he explodes into the background.
Master Hand received a multitude of alterations to his overall fighting style when moving on to Melee. His moveset is slightly altered and expanded, he loses the ability to turn around, and his HP is altered based on the difficulty. In addition to this increase in HP, his power increases with each increment in difficulty, with the highest levels giving him a multitude of attacks with OHKO potential. Additionally, instead of appearing as a glove with a "cuff", Master Hand's "wrist" fades into nothingness.
The game also introduced Crazy Hand, Master Hand's left-handed partner. When the two are on the field at the same time, they can perform powerful combination attacks. Crazy Hand appears when set conditions are met. The duo also appear in Event 50: Final Destination Match as boss characters.
Master Hand reprises his role as the final boss of Classic Mode in Super Smash Bros. Brawl, and once again is fought on Final Destination. His attacks are very similar to that of his Melee form with some changes. The amount of HP he has is still dependent on the difficulty as well. Crazy Hand also returns in Classic Mode, if certain conditions are met.
Master Hand also appears in The Subspace Emissary, as the one giving orders to Ganondorf, Bowser and Wario. Soon after a Subspace Bomb is used on King Dedede's castle, Ganondorf receives new orders from Master Hand, which he gets via a TV screen; this leads the player to believe that Master Hand acts as the primary antagonist of the mode.
However, when all of the characters arrive in Subspace, Ganondorf reports to Master Hand after betraying Bowser; when Master Hand shows himself, however, Ganondorf learns that he has actually been under the control of Tabuu via the Chains of Light. Ganondorf attacks Tabuu with his Dark Dive as an act of defiance, but is easily knocked back, though his fall causes him to break the Chains of Light that Tabuu had controlled Master Hand with, thus freeing him. Master Hand too attempts to strike Tabuu, but just like Ganondorf, is defeated with little effort. As he is a different kind of being from the playable characters, he does not change into a trophy, and simply lies motionless on the ground when defeated by Tabuu, appearing to bleed from the areas he was previously attached to; his ultimate fate is never shown.
Knowing that he would be able to use Master Hand to recruit fighters to aid him in his goals, Tabuu enslaved Master Hand with the Chains of Light some time before the plot of the Subspace Emissary begins.
Master Hand reprises his role as the final boss of Classic Mode in Super Smash Bros. for Nintendo 3DS, at least at the lower intensities. In higher intensities, he is fought along with Crazy Hand and after taking a certain amount of damage transforms into a dark mass named Master Core. In Super Smash Bros. for Wii U, he also has his own mode named Master Orders.
Unlike the previous games, Master Hand and Crazy Hand share a HP meter. They also have multiple new attacks, such as tossing energy balls to one another and opening a rift that sucks in characters that get caught inside.
Master Hand appears in the Game Boy Advance game Kirby and the Amazing Mirror as a mini-boss. Vacuuming him up will give Kirby the Smash ability, an ability that gives Kirby some of his moves from Super Smash Bros. Melee (though in a slightly altered state). Master Hand and Crazy Hand are also the bosses of the Candy Constellation stage.
While Master Hand originated in the Smash series, his attacks are very similar to those of Wham Bam Rock in Kirby Super Star (Kirby's Fun Pak in the PAL regions).
Wham Bam Rock attacks using its hand, made out of rocks. One similar move is that Wham Bam Rock and Master Hand point at the player like a gun; however, Wham Bam Rock proceeds to make rocks fall, while Master Hand shoots out bullets. Both Wham Bam Rock and Master Hand perform a move that involves "walking" across the stage to flick the player. They both will also try to grab on to the player and crush them.
In Melee, the Master Hand glitch, a particular application of the Name Entry glitch, allows a player to control Master Hand. Aside from this, the only other methods of controlling Master Hand are by hacking with a cheating device such as GameShark or Action Replay. Several rumors exist of being able to control Master Hand in other games, particularly the original Super Smash Bros., all currently are false.