|“||Collect the Metamortex that can be found on stages and you'll transform into various objects and be able to perform special actions.”|
|— Official European Kirby's Epic Yarn website|
A Metamortex is a circular ball of yarn with a rainbow-colored icon in the middle that gives Kirby his super transformations, which take the place of Copy Abilities in Kirby's Epic Yarn and Kirby's Extra Epic Yarn. The transformation given depends on the icon on the Metamortex. There are other Metamortexes which power-up Kirby and Prince Fluff already in a super transformation.
Super transformation Metamortexes are hidden behind a circular patch that resembles the Metamortex itself, without the icon in the middle. The Metamortex will be revealed when the patch is removed using the Yarn Whip. Power-up Metamortexes are never hidden behind a patch.
Metamortexes always have a rotating spiral outer yarn border of 2 different colors. These two colors, along with Kirby's red and pink, and Prince Fluff's blue and orange, make up the final appearance and color scheme of the super transformation. Power-up Metamortexes do not rotate, and have 2 circular outer borders.
Every Transformation sequence starts with a Metamortex patch, and Kirby and Prince Fluff cannot move forward until either character touches the Metamortex. Kirby and Prince Fluff are then permanently transformed until they touch the Reel Gate, which is a vertical or horizontal wooden bar which the two wrap themselves around to get rid of the extra yarn from the Metamortex, thus ending the super transformation sequence. Kirby and Prince Fluff cannot pass through the reel gate in normal form.
|Digger||Kirby pilots a machine that can excavate cotton blocks, and destroy crystal blocks obscuring doorways or beads. It can cling to and move on walls and ceilings of cotton.|
|Dolphin||Kirby's speed underwater is unmatched while in this form, and he gains a powerful surge attack. Kirby can swim up waterfalls, jump out of the water, swim through hoops to get beads, and bounce balls on his nose.|
|Fire Engine||Kirby can put out fire enemies and fires, and temporarily solidify lava to make platforms.|
|Off-Roader||Kirby is faster and can jump higher than in car form. Kirby can grab a power-up that makes him go even faster and gives the ability to break through blocks.|
|Rocket||Kirby can fly around and destroy enemies by shooting stars at them in a manner similar to Space Invaders.|
|Saucer||Kirby pilots a UFO that is able to absorb enemies. When 3 enemies are absorbed, he can blast out an attack destroying almost everything on-screen.|
|Spin Boarder||Kirby surfs or snowboards, and can jump while doing so. He can grab a pair of wings that increases the height and distance of his next jump.|
|Star Shooter||Virtually identical to its appearance in Kirby Super Star and Ultra, it flies and fires star shots sideways.|
|Tankbot||Kirby pilots a large robotic tank with light-up eyes. It can hover a short distance, and shoots Missiles. When there are 2 players, the tank gets a boxing glove as well, which is controlled by whichever player did not grab the power-up.|
|Train||Kirby can travel on train tracks that lead him to new areas. The tracks are drawn by the player.|
For the Off-Roader, Spin Boarder and Tankbot forms, the character who touches the Metamortex assumes the main form and the player controlling him is granted full controls, and player 2, if present, is granted a support power. In Train form, however, players take turns drawing tracks. In Digger, Dolphin, Fire Engine, Rocket, Saucer, and Star Shooter forms, players have independent control as Kirby and Prince Fluff transform separately.
The 'Metamor' part of 'Metamortex' comes from metamorphosis, referring to its ability to transform Kirby and Prince Fluff into other shapes, while the '-ortex' part comes from vortex, in reference to its spiraling appearance.
- When Kirby and Prince Fluff battle Mega Yin-Yarn, Meta Knight flies along and drops a Metamortex granting the Tankbot super transformation. This is the only non-power-up Metamortex not hidden behind a circular Metamortex patch in the main story (though some also appear in some challenges, such as Beadrix's).
- It is possible the Metamato is affiliated with the Metamortex, as Kirby was able to turn himself into a car sometime after he ate it.