Editing Master Hand (SSBU)

|caption = [[File:SmashBrosSymbol.svg|50px]]<br>Master Hand's render in ''Super Smash Bros. Ultimate''

Master Hand appears as a boss in Classic Mode. For the first time since the original ''[[Super Smash Bros.]]'', Master Hand has the ability to face in either direction (left or right), which he combines with snapping his fingers to teleport around. Also for the first time in the series since ''Brawl'''s [[Boss Battles]], Master Hand no longer has a stamina HP indicator, instead having a health bar akin to bosses from [[Subspace Emissary]] or [[World of Light]]. This results in {{SSBU|Crazy Hand}} having a separate health bar as well, meaning that they no longer share the same pool of HP as they did in ''Smash 4''. However, he can now be stunned, which renders him immobile on the ground for about 8 seconds.

Unlike other installments, not every fighter battles with Master Hand at the end of their Classic Mode route. Mario, Link, Yoshi, Kirby, Luigi, Captain Falcon, Jigglypuff, Bowser, Zelda, Marth, Young Link, Dark Pit, Snake, R.O.B, Toon Link, Wolf, Mega Man, Rosalina & Luma, Pac-Man, Duck Hunt, Bayonetta, Inkling, Simon, Richter, King K. Rool, Piranha Plant, Hero, Terry, Min Min and Steve all face someone other than Master Hand at the end of their route. Falco and Ken only fight Master Hand along with Crazy Hand if the intensity is 7.0 or above. Some fighters like Pikachu first fight Mewtwo before facing Master Hand. All the fighters who fight Master Hand, except for Pikachu and Pokémon Trainer, fight both of Master and Crazy Hand if the intensity is 7.0 or above. Ice Climbers, Mewtwo, Chrom, Meta Knight, Pit, Diddy Kong, Ryu, Incineroar, Banjo & Kazooie and Byleth always fight both of the Hands.

Master Hand has received the greatest overhaul of any incarnation, gaining a significantly larger moveset overall. Moves that can be used while Master Hand is playable in World of Light are marked based on their input.  

|Big Swipe|| Side Attack || 13.8% ||Master Hand makes a big open-hand swipe across the stage.

|Fake-Out Slap|| Down Attack || 15.2% ||Master Hand holds a fist above the player as if to punch them, but instead opens up and comes down with a slap.

|Finger Bullet|| Neutral Special || 12.4%(one pair) 9.7%(three)  ||Master Hand fires pairs of bullets - one pair normally, or three at low health. These can be reflected. When controlling, holding Special fires more pairs of bullets, also up to three.

|Finger Drill|| Up Attack || 45.2% ||Master Hand drops from above, spinning and drilling into the player. It [[Bury|buries]] the player if it connect dead-on, and also has a [[Windbox#Pulling attacks|vacuum]] effect to pull the player in if they're barely out of range.

|Fireball Frenzy|| Unavailable || 14.5% ||Master Hand retreats into the background and produces between three and five fireballs, which he throws at the player. He then returns to the stage with a flying punch.

|Hazardous Smudge|| Unavailable || 14.8% ||Master Hand drags a finger over the floor, causing a string of damaging spikes to sprout in that location. If the player can get Master Hand to touch the spikes (by Finger Drill or Fake-Out Slap), he will become stunned. When fighting both Master Hand and Crazy Hand, the latter can also be stunned by getting him to touch the spikes (by Finger Drill, Spasm, or Spider Walk).

|Ink Blob|| Unavailable || 9.7% ||Master Hand creates a large ball of [[ink]] that covers both the player and the screen. The ink is an aqua color that doesn't match any [[Inkling]].

|Jetstream|| Unavailable || 13.75% ||Master Hand flies into the air and swoops in from the background.

|Laser Nail|| Down Special || 6.4% ||Master Hand fires a blue laser from each fingertip.

|Mirrored Laser|| Unavailable || 31.1% ||Master Hand produces a series of mirrors and fires a single laser that bounces between them.

|Ring Toss|| Side Special || 20.2% ||Master Hand throws two rings across the stage. They may or may not circle back around for another pass.

|Snapper|| Neutral Attack || 11.1% ||Master Hand snaps his fingers, stunning the player.

|Spike Bowl|| Up Special || 16.1% ||Master Hand underhands a series of spiked balls across the stage, which may either roll or bounce. They can be attacked, reflected, or even picked up with the right timing.

|Squeeze|| Unavailable || 19.4% ||Master Hand's pummel, when low health he will throw the player out of [[blast line]] for finishing move.

|Snap Teleport|| Unavailable || 0% ||Master Hand teleports by snapping his fingers.

|Cross Punch|| ||[[Crazy Hand]] punches across the stage, with Master Hand catching him.

|Dual Lasers|| ||The two hands both use Laser Nail at once, sweeping across the entire stage.

|Dual Sweep|| ||[[Crazy Hand]] runs his fingers across the stage like a plow, while Master Hand flies in the other direction with an uppercut.

|Shadow Puppet|| 25.8% ||The two hands form a canine-like shape and emit three damaging "barks", the third, much larger than the rest, causes the player character to get stunned if unblocked and within range.

|Static Discharge|| 33.8% ||The two hands rub the back of their hands to charge up with electricity, then slap the stage to release electricity that covers the whole stage platform.

|Zoom In|| N/A || Master Hand and [[Crazy Hand]] create a "picture frame" (with their index fingers and thumbs), causing the screen to zoom in and flames to cover the corners in a similar vein to [[Sudden Death]]. During this time, the blast lines are closer, and the player can get KO'd much more easily. This effect is only temporary.

Once the player manages to get the true ending's requirements, Master Hand and Crazy Hand are freed and they help the player by using their Static Discharge joint technique to create a giant rift in the map, which Master Hand enters, leading to the penultimate level where Master Hand himself is made into a playable character, engaging in a [[Mob Smash]] against 50 light and dark [[false character|puppet fighter]]s. The only puppet fighters used in this battle are {{SSBU|Mario}}, {{SSBU|Link}}, {{SSBU|Samus}}, {{SSBU|Meta Knight}}, {{SSBU|Snake}}, {{SSBU|Sonic}}, {{SSBU|Cloud}}, and {{SSBU|King K. Rool}}.

Master Hand's freedom suggests that, like the fighters, he was captured by Galeem before the events of World of Light and then cloned into controllable puppets.

*In the opening cinematic of Adventure Mode, Marth estimates that each fighter will need to take down about ten Master Hands, implying that there are between 770 and 990 Master Hands, if the player counts [[Echo Fighters]], male/female fighter variants, Olimar/Alph, the four [[Minecraft]] fighter variants, and the 7 Koopalings as separate characters.

*Master Hand's Mirrored Laser attack looks and acts very similarly to one of the attacks of the second form of {{s|wikirby|Dark Mind}}, the final boss from ''{{s|wikirby|Kirby & The Amazing Mirror}}'', making this the second time his attacks takes inspiration from the ''Kirby'' series. Coincidentally, Master Hand appears in said game both as a miniboss and a boss alongside Crazy Hand.

*{{SSBU|Mewtwo}}, {{SSBU|Ryu}}, {{SSBU|Joker}} and {{SSBU|Byleth}} are the only characters who fight Master Hand (with or without Crazy Hand in Joker's case), with a music track outside of said boss' universe playing in the background.

*The battle with Master Hand can be softlocked by defeating him on the exact frame he is rendered invulnerable, causing him to be immortal and confuse the game to be in a fighting and victory state. Since blast zones are disabled, the player is able to fall indefinitely. Eventually, the player's character's y-axis position goes so high, it is rendered as negative, in which it distorts some of Master Hand's attacks such as the Ink Blob to be thrown upwards, his Finger Bullets angling downwards, homing attacks missing entirely, and his grab being performed immediately and also missing. Even more effects can occur, one of them being the Radar and Magnifying Glass showing inconsistencies of where the character is.<ref>[https://youtu.be/2RUbQzdlxeM] Evidence of the glitch occurring</ref><ref>[https://youtu.be/gKmo7N4_m2o]</ref>

*Another soft lock can occur when stunning Master Hand after countering his Fireball Frenzy.