Kirby (SSB)/Up special

Overview
The special move's name is Final Cutter, where Kirby pulls out a sword, goes up in midair while swinging it upward, and, once at a certain height, falls down to the ground while bringing the sword downwards. When he lands, it will also make a wave projectile that will travel a certain distance in the direction Kirby is facing. This attack deals 8% damage when Kirby swings upwards, 2% damage when swinging downwards, and 3% damage when Kirby smashes the sword for a total of 13% damage, with the wave doing 6% damage and decent knockback.

The move is mainly used for his recovery, giving decent vertical distance and a bit of horizontal distance if the player tilts the control stick left or right. However, if Kirby is offstage and uses this move and does not make it to the edge, he will be unable to do anything, so he will plummet to the lower blast line and SD.

When Kirby is descending, it gives a very powerful meteor smash with set knockback. Thus it can potentially good for edge-guarding, but again, if it is used offstage, Kirby must be able to grab the edge or he will SD. The move is able to edgeguard certain recoveries such as 's Quick Attack and 's Fire Fox if used near the edge while facing offstage, due to the opponent heading into it. It is not recommended to use this onstage, as the horizontally-hitting hitbox that the meteor smashed opponent will be linked into lacks power and combo ability, and it is possible for the opponent to trade with the meteor smash hit, using moves with fast startup, such as many neutral aerials.

Glitches
There are two known glitches in Final Cutter.

One is called Kirby's Sliding Up B done by: Dashing, wait for the dash to to finish which is about 14 frames, turning instantly, and then do an up special 20 frames after you decided to do so. This is similar to Teleporting but is harder and is generally limited to flashy play/TASing. This was discovered by DSGnoll, a Japanese smash 64 player. The video, as popularized by Jpheal, a well known TAS player.

The other is the Bigger Kirby Glitch, where if Kirby uses Final Cutter in midair, whether he lands or not, he will grow slightly, an 8.7% increase (0.91× (0.94× in the Japanese version) → 1.0×). This lasts until Kirby loses a stock. This can actually have an effect on gameplay: Being larger, an advantage is that Kirby has more range. He can up smash from the ground in and hit one of the lower platforms. This can also improve his spacing game, as it improves range noticeably on his neutral aerial and up tilt. However, the downside is that his hurtbox is larger, so, for example, he can no longer reliably crouch under ' fully charged Charge Shot. Discussed here.

Hitboxes

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