The final battle. After being tossed around mostly at Sectonia's mercy throughout the first phase, Dedede and Taranza come to the rescue with the final Hypernova transformation. Cue Kirby's transformation as a golden sunrise forms on the horizon just to drive the point home, and Sectonia roars in clear displeasure. From here it's smooth sailing as Kirby's all-powerful inhalation tears through every one of her defenses.
When she's finally flipped her lid and is down to nearly no health, Sectonia moves to the end of the stage and unleashes a Wave Motion Gun on the rainbowy puffball. Cue a beam struggle between her own attack and Kirby's inhalation of it. Not only does he inhale the laser, he cranks his inhaling Up to 11 beyond anything seen in the series before, by inhaling the aforementioned huge laser, the giant flower her body fused to, nearly all of the platform he's fighting on, and her health bar right off the screen. He then returns it all in an even larger beam (with little stars and hearts inside) following one of the only instances we ever see him do a Death Glare at a foe. Needless to say, Sectonia is vaporized. O.O.C. Is Serious Business, indeed.
Considering all the horrid crap that Sectonia put Floralia through, the fact that Kirby gave her said Death Glare and blasted her away with her own beam was very satisfying.
In the True Arena, she has a form beyond that, where she, wait for it... detaches her own head from her body to continue fighting.
In Stage 6-1, you're constantly hounded by a huge side-scrolling tank in the background. Later on, right before the end of Stage 6-3, where Kirby is Hypernova the entire time, you tear off part of a curtain to reveal the tank once more. This time, it's on a stationary platform so it can't follow you, but it will fire off its ammo at you. The solution? Take the star into the background, then inhale that beast! It takes the longest to destroy, and Kirby even spits out the exit door!
Masked Dedede coming at you with an AXE.
Dedede sending Dark Meta Knight back to the Dimension Mirror and destroying both with his Hammer at the end of his mode.
The last four key chains are all of 3D characters (specifically, Yin-Yarn, Magolor, Taranza, and Sectonia) all redone in 2D, and they look really good.
The 100% video. Sure, it's pretty much the same as it was in Super Star Ultra and Return to Dreamland, but it's still awesome. The audience in particular - the People of the Sky and Dark Meta Knight are flying around and a few other characters (namely Meta Knight, Marx, Galacta Knight, and Magolor) are also in the audience.
Using Hypernova on Flowery Woods late in the game. You start by inhaling all of the flowers off, then you pull the life bar off of the screen and swallow that, followed by uprooting Flowery Woods and swallowing it. All in one breath.
In the second extra level for Royal Road, you get a Hypernova, but instead of the usual music, the Super Smash Bros. Fountain of Dreams version of the Gourmet Race music kicks up, and it is amazing.
The premise of the game is ultimately revealed to be that Taranza mistook Dedede as the greatest hero in Dream Land instead of Kirby. Word of God heavily implies a fantastic bit of irony: While Kirby takes down Sectonia, he never finds out that there was someone else who spurred her into villainy. Who does find out? King Dedede, who returns to Sectonia's lair, takes down the likely mastermind (a vengeful Dark Meta Knight), and destroys the corrupting influence (the Dimension Mirror).