Kirby draws a silver blade, similar to a scimitar, jumps into the air a bit less than the height of Falco's full jump, and falls quickly, releasing a blue "wave" projectile forward if he lands on a solid surface, travelling the distance of a Falco Phantasm. This attack is somewhat similar to Ike's Aether.
The move generally hits best on the way up and at the very end of the attack. Although it lost much power and use in the transition from Super Smash Bros. to Super Smash Bros. Melee, it is still quite useful to skilled players. It should also be noted that the move as a whole can be moved much further horizontally when used on the ground as opposed to in the air. In Super Smash Bros. Brawl, the Final Cutter is stronger than in Melee.
The descent of the move delivers a heavy meteor smash, which is easier to use over a pit. This can develop into a technique known as Cuttercide/Kutterkaze. When the opponent is trying to recover, Final Cutter can be used to intercept them and spike them downward, killing both the player and (most of the time) the opponent as well (beware that the player using Cuttercide passes the blast line first.)
In Super Smash Bros. and Super Smash Bros. Melee, players using this move lose all of their jumps if knocked out of it.
This move is also useful against edgeguarding if used high in the air at the top corners of stages, such as Final Destination or Battlefield. If Kirby performed the move at a good enough distance and an edgeguarder was in the air coming for it, Kirby could potentially catch the opponent on the sword's descent, sending them towards the lower blast line and finding itself grabbing the edge.
Unlike most other recovery moves, Final Cutter does not throw Kirby into helplessness; when the ascent is finished, Kirby falls quickly and retains the hitbox. However, if Kirby lands at the edge of a platform and is pushed off by wind, conveyor belts, Mario's F.L.U.D.D., Squirtle's Water Gun or simply pushing him off while he is still in his ground-slam animation, Kirby will quickly slide off into his helpless form.
In the story, Kirby uses the move to cut down King Dedede's stolen Cargo and secure a pair of trophies, either Mario and Pit's or Link and Yoshi's, depending on which princess Kirby rescued from Petey Piranha.
Special Move customization was added in Super Smash Bros. 4. These are the variations:
The Final Cutter first appeared as a special move in Kirby Super Star, then-known as "Nonstop cutter attack". When Kirby had the Cutter ability and was close enough to the enemy while attacking, the normally ranged Cutter technique would become a rapid slashing combo attack known as the Cleaving Cutter (an inward chop, then a turning inward-upward 180 slash akin to his "Cutter Dash" move), ending in the Final Cutter.
In Kirby & The Amazing Mirror and Kirby: Squeak Squad, Final Cutter also appears as part of the Sword ability, functioning exactly like it does in Smash Bros. The Smash Bros. ability, which appears in Amazing Mirror, Kirby's Dream Collection, and Kirby: Planet Robobot, also includes Final Cutter with its Smash Bros. functionality, even featuring the same blade design.
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