Master Hand (SSBM)
Master Hand (known internally as MASTERH) is a boss appearing in Super Smash Bros. Melee, reprising his role as a boss in the single-player mode of Super Smash Bros.. He is the final boss of the 1-player Classic Mode, and has a set HP which must be depleted to win; he does not appear in the Adventure Mode or All-Star Mode, where his role is replaced instead by Giga Bowser and a team of Mr. Game & Watches. He is fought on the Melee version of Final Destination. Defeating Master Hand once again causes the screen to fade to white as he explodes into the background; after the last results screen, the player's character is seen tumbling, then turning into their Trophy state, landing in the Collection room of the game. Master Hand can be played via use of the Master Hand glitch.
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. If the player reduces Master Hand's HP by half, Crazy Hand appears then starts with the same number of HP (matching the difficulty) to whatever Master Hand started with from the beginning. 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.
Master Hand does not appear in the opening cinematic, though his trophy (see below) elaborates his role in the Super Smash Bros. universe.
Changes from SSB to Melee
Note that none of the names are official. Master Hand can only be played by using the debug menu through an Action Replay, or the use of the Master Hand glitch. All directions are pressed on the D-Pad, not the Control Stick. Lastly, Master Hand can only be controlled by Player 3.
In combination with Crazy Hand
The damage recorded here is only for Master Hand's contribution to the attack. For Crazy Hand's contribution, see Crazy Hand (SSBM).
In terms of debug mode inputs, Crazy Hand must go first. Then, Master Hand must finish what he's doing and input Y↑. Not doing so will leave Crazy Hand stuck in the "waiting for Master Hand" phase until either of them is KO'd. If Crazy Hand inputs Y←, Master Hand will ignore it (the corresponding attack is disabled), which will guarantee this.